An astronaut floating freely in space decides to use his flash light as a rocket. He shines a 10 watt light beam in a fixed direction so that he acquires momentum in the opposite direction. If his mass is 80 kg , how long must he need to reach a velocity of 1 ms –1
Text Solution
Verified by ExpertsThe correct answer is:
D
Let it take t sec for astronaut to acquire a velocity of 1 ms –1 . Then energy of photons = 10 t
Momentum 
= 80 × × 1
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