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Q.

A body of mass 0.5 kg is projected vertically upwards with velocity of 40 m/s. Its maximum gravitational potential energy is found to be 80% of initial kinetic energy. Then the average air resistance acting on the body is

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a

2.50 N

b

1.25 N

c

4.25 N

d

1.5 N

answer is B.

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Detailed Solution

mgH=80100×12mV2⇒ H=2V25g=2×4025×10m=64 mAt the highest lost energy = 20% of initial K.E∴ R×64=20100×12×0.5×402⇒R=1.25 N
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