A car of mass 
and travelling at 72 kmph crashes into a truck of mass 
and travelling at 9 kmph, in the same direction. The car bounces back at a speed of 18 kmph. The speed of the truck after the impact is
Text Solution
Verified by ExpertsThe correct answer is:
B
For uniform angular acceleration in a circular path, the angular speed is given by
ω ω 2 = 
= 0 + 2 α α (2 π π n)
kinetic energy of the particle
KE = 
m(R ω ω ) 2 = 
mR 2 (4 α α π π n) = 2 π π nm α α R 2 .
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