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Two bodies one light and other heavy have equal momentum.Which of them has higher kinetic energy?
(Aajma Manoj asked)
The lighter body will have greater kinetic energy.
squaring both sides, p2 = m2v2
Kinetic Energy = 1/2 mv2 = p2/2m
Therefore, for bodies of equal momenta, kinetic energy is inversely proportional to mass.
An 8000 kg engine pulls 40000 kg train alonged a level track and gives an acceleration of 1.2m/s2. Find the accelaration produced by same engine on a train of mass 16000kg?
Force exerted by the engine = mass of train x acceleration = 40000 x 1.2=48000N
When the same engine pulls a 16000 kg train, the acceleration = 48000/16000=3m/s2