Two blocks of equal masses are placed on a horizontal surface. The surface of A is smooth but that of B has a friction coefficient of 0.2 with the floor. Block A is given a speed of 5 m/s, towards B which is kept at rest. If the distance travelled by B is 
λ then find λ if the collision is perfectly elastic. Take g = 10 m/s 2 .
Text Solution
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CHECK THE SOLUTION.
(5)
V 2 = U 2 + 2as 0 = (V) 2 – 2as s = 
e = 1 so after collision V A = 0 and V B = 5 m/sec
So μ mg = ma s = 
∴ s = 6.25 m
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