MYTUTOR SUBJECT ANSWERS

276 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...

7 months ago

Answered by Joshua, a GCSE Physics tutor with MyTutor


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

139 SUBJECT SPECIALISTS

£20 /hr

Dan B.

Degree: MPhys Physics (Masters) - Exeter University

Subjects offered: Physics, Maths

Physics
Maths

“Hi I'm Dan and I'm in the first year of a four-year MPhys Physics degree at the University of Exeter. I am very patient and will tailor the sessions' content and pace to suit your individual needs...”

£18 /hr

Imogen N.

Degree: Philosophy (Bachelors) - Durham University

Subjects offered: Physics, Philosophy and Ethics+ 2 more

Physics
Philosophy and Ethics
Maths
-Personal Statements-

“A bit about me... Hi I'm Imogen and currently I am studying Philosophy at Durham University. Philosophy is obviously something I am very passionate about and I love discussing big issues and getting to the heart of a problem. I also d...”

MyTutor guarantee

£18 /hr

Hannah J.

Degree: Mathematics (Bachelors) - Durham University

Subjects offered: Physics, Science+ 3 more

Physics
Science
Maths
Further Mathematics
French

“I'm a first year Maths student at Durham University and I've always loved Science and Maths. Having taught swimming for 2 years, and English, French and Maths in a primary school for a year, I have become a patient and understanding t...”

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

What is induced in the core of a transformer

What is constant acceleration?

What is the difference between Transverse and Longitudinal waves?

What are some key differences between sound and light waves?

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