Trolley A carrying mass 10kg is moving at speed 5m/s, and collides with stationary Trolley B carrying a mass 5kg. Indicating which Law you would apply, what is the speed and direction of Trolley B if Trolley A's resulting movement is 2m/s to the left?
By the Law of Conservation of Momentum, Initial Momentum=Final Momentum, in a closed system.
Take movement to the right as + and to the left as -
Therefore equate the two as such: Initial (A+B) = final (A+B)
A+B = A+B
(+5x10) + (5x0) = (-2x10) + (5 x Y)
Y indicates speed of B
50+0=-20+5Y
70=5Y
Y=70/5
Y=+14m/s
Therefore Trolley B moves to the right at a speed of 14m/s
PS
Related Physics GCSE answers
All answers ▸Why do airbags make a car safer
If a car sets off from rest with a constant acceleration of 3 m/(s^2), what would its speed be after 5 seconds?
As a student rubs his feet along the carpet in his living room, he becomes charged. After this he places his hand on a metal radiator and receives an electric shock. Explain what charge the student obtains, why, and why he receives a shock.
Explain the resistance of and electrical component and what affects its value in a wire.