51 A lorry of mass 4000kg is travelling at a speed of 4.0m/ s.
A car has a mass of 1000kg. The kinetic energy of the car is equal to the kinetic energy of the
lorry.
What is the speed of the car?
A 2.0 m/ s B 4.0m/ s C 8.0m/ s D 16.0m/ s
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Answer:
D 16 m/s
KE1=4000x4
KE1=16000 J
A/Q
16000=1000v
v=16000/1000
v=16 m/s
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