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Q.

A man and a cart move towards each other. The man weighs 64kg and the cart weighs 32kg. The velocity of the man is 5.4 km/hr and that of the cart is1.8 km/hr . When the man approaches the cart, he jumps on to it. The velocity of the cart carrying the man will be

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a

3 km/hr

b

30 km/hr

c

1.8 km/hr

d

Zero

answer is A.

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Detailed Solution

m1=64,  m2=32

u1=5.4,  u2=1.8

m1u1+m2u2=(m1+m2)v

v=345.6−57.696

v=28896

v=3 m/s

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