MYTUTOR SUBJECT ANSWERS

524 views

Trolley A weighs 5kg and is moving at 15m/s to the right. It collides with a stationary Trolley B, weighing 10kg more than Trolley A. After the collision they move off together. Calulate the velocity that they move off with.

To start with, we should work out all of the quantities we need: 

Mass of Trolley A:  MA= 5kg 

Mass of Trolley B: B weighs 10kg more than A 

--> Therefore MB= 10 + 5 = 15kg 

Mass of Both Trolleys together: MAB = 15 + 5 = 20kg

Initial Velocity of A: VA= 15 m/s 

Initial Velocity of B: VB= 0 m/s

By the conservation of momentum, we know that the total momentum of a closed system is unchanged for any process. Thus the initial and final momenta of the two trollies combined are the same, ie:

PA + PB = PAB where P is momentum

We know that momentum P = mv

Therefore:

MAVA + MBVB = MABVAB

From above, we know all of these quantities except for VAB which is the quantity we need to find for the answer. Thus we can substitute in all of the values and find VAB:

(5x15) + (15x0) = (20xVAB)

75 = 20VAB

VAB = 75/20 = 3.75 m/s

Joshua D. GCSE Maths tutor, 11 Plus Maths tutor, IB Maths tutor, 13 p...

1 year ago

Answered by Joshua, a GCSE Physics tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

197 SUBJECT SPECIALISTS

£22 /hr

Nketia O.

Degree: Pharmacy (Masters) - Durham University

Subjects offered:Physics, Chemistry+ 1 more

Physics
Chemistry
Biology

“Hello! My name’s Nketia. I got an A* in A-Level Biology and an A in A-Level Chemistry. I’m a second-year Pharmacy student who is ready to teach others.”

£18 /hr

Laura K.

Degree: Chemical Engineering (Masters) - Bath University

Subjects offered:Physics, Science+ 3 more

Physics
Science
Maths
Further Mathematics
Chemistry

“Hey there! I am Laura and I am currently studying Chemical Engineering at University of Bath. I am really passionate about Science and I am willing to share my knowledge through tutoring you. My passion and expertise in science can be...”

£18 /hr

Mabast H.

Degree: Physics (Bachelors) - Imperial College London University

Subjects offered:Physics, Maths+ 3 more

Physics
Maths
Further Mathematics
Chemistry
-Personal Statements-

“Undergraduate Physicist with lots of experience in teaching in different fields and age groups, looking to instil a passion for learning into students.”

MyTutor guarantee

About the author

Joshua D.

Currently unavailable: for regular students

Degree: Materials Science (Masters) - Oxford, Corpus Christi College University

Subjects offered:Physics, Maths+ 4 more

Physics
Maths
French
Chemistry
.PAT.
-Personal Statements-

“About Me Hi! I'm an Undergraduate studying Materials Science at the University of Oxford, about to begin my second year of study. I have a passion for the Physical Sciences - in particularMaths, Physics and Chemistry, and am keen to ...”

You may also like...

Posts by Joshua

How can I impress the examiner in the writing paper of my GCSE exam?

Solve the equation log(1-x) - log(x) = 1 where log() is the logarithmic function, base 10.

Trolley A weighs 5kg and is moving at 15m/s to the right. It collides with a stationary Trolley B, weighing 10kg more than Trolley A. After the collision they move off together. Calulate the velocity that they move off with.

Other GCSE Physics questions

Trolley A weighs 5kg and is moving at 15m/s to the right. It collides with a stationary Trolley B, weighing 10kg more than Trolley A. After the collision they move off together. Calulate the velocity that they move off with.

Why does lowering the control rods in a nuclear reactor reduce the amount of energy released each second from the nuclear fuel?

At what angle does total internal reflection occur?

A musical instrument produces a sound wave with a frequency of 1000 Hz. The sound wave has a wavelength of 0.34 m in air. Calculate the speed of the sound wave in air.

View GCSE Physics tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok