MYTUTOR SUBJECT ANSWERS

234 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...

6 months ago

Answered by Joshua, a GCSE Physics tutor with MyTutor


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

104 SUBJECT SPECIALISTS

£18 /hr

Wesley M.

Degree: Mathematics (Masters) - Bristol University

Subjects offered: Physics, Maths+ 1 more

Physics
Maths
Chemistry

“I am a current Mathematics student at The University of Bristol. Maths can be a love-hate sort of subject for many people, but with my absolute love and enthusiasm for both maths itself and the idea of inspiring others, I hope to be a...”

£20 /hr

Jonas P.

Degree: MPhys Theoretical Physics (Bachelors) - Edinburgh University

Subjects offered: Physics, Maths

Physics
Maths

“I am currently a student at the University of Edinburgh, doing my 4th year of the MPhys Theoretical Physics programme. I've managed to score an average grade of 81% in year 3, and I tend to consistently do well in my exams, which I be...”

£18 /hr

Hannah C.

Degree: Chemistry (Masters) - Durham University

Subjects offered: Physics, Maths+ 2 more

Physics
Maths
German
Chemistry

“About me I am a Chemistry student at Durham university. I am a friendly and paitient tutor, and I belive that anyone can do Maths and Science with practice! I hope to make Science and Maths more approachable and understandable (as wel...”

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

When should you use the SUVAT equations?

A bullet is fired horizontally from a rifle 1.5m from the ground at 430m/s. How far does it travel and for how long does it travel before it hits the ground?

What is the unit frequency is measured in?

Explain Newton's laws of motion

View GCSE Physics tutors

Cookies:

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

mtw:mercury1:status:ok