A physics Q plz help (: As LEVEL?
Two trolleys mass 2kg and 1kg are placed together on a horizontal runway with a compressed spring between them.
when they are released, the 2kg trolley moves to the left at 2m/s.
how much energy was stored in the spring?
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So the 1kg. trolley moves the other way, at 4m/sec., as their momentums are equal.
Total speed = 6m/sec.
Total mass = 3kg.
KE = 1/2 (mv^2), = 54 Joules.