SSC JE Mechanical Engineering 2017 Set 5 Paper

Question : 168 of 200

Marks: +1, -0

If a light and a heavy body have equal kinetic energy of translation, then _______.

Solution:

Kinetic energy is given as

K=1/2mv^2=1/2P^2/m

where,
P = momentum = mv
It is given that

K_l = K_h

P_l^2/{2m_l}=P_h^2/{2m_h}

P_l^2×m_h=P_h^2×m_l

Since,

m_h > m_l.

P_l^2 < P_h^2

P_l < P_h

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