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 $1$ $ms^{-1}$
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 $1$ $ms^{-1}$
- A
$9$ sec
- B
$2.4 \times 10^3\, sec$
- C
$2.4 \times 10^6 \,sec$
- D
$2.4 \times 10^9\,sec$
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- [JEE MAIN 2020]
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