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
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