Two trolleys are travelling in the same direction as shown in the diagram. The trolleys collide. After impact they move off together. What is the amount of kinetic energy lost?

A6J

B12J

C18J

D36J

Explanation: Initial momentum = 2×4 + 4×1 = 12 kg·m/s. Combined mass = 6kg, so v = 2 m/s. Initial KE = ½×2×16 + ½×4×1 = 16+2 = 18J. Final KE = ½×6×4 = 12J. KE lost = 18-12 = 6J.

ZIMSEC Physics Paper 1, November 2002, Q5

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Two trolleys are travelling in the same direction as shown in the diagram. The trolleys collide. After impact they move off together. What is the amount of kinetic energy lost?

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