A cube of mass 3kg is kept on a frictionless horizontal surface. The block is given an impulse so that point ‘A’ acquires velocity 4 m/s in the direction shown. If speed of point B is 
m/s, K.E. of block (in Joule) minus 10 Joule is –
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(6)
Sol. Let angular velocity about centre of mass be ‘ꞷ’ and velocity about centre of mass be V cm .
ꞷ = 
= 40 rad/sec (a = 10 cm)
V = V A sin 45° = 
m/s
K.E. = 
+ 
Iꞷ 2 = 16 J
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