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Work Energy and Power question

2000 · Q152
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Work Energy and Power question

2000 · Q152

NEETPhysicsWork Energy and PowerMCQ+4 / −1
A mass of 1 kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s. The velocity of other part is (Take g = 10 ms−-−2)
  1. A
    40 m/s
  2. B
    50 m/s
  3. C
    100 m/s
  4. D
    60 m/s
View written solutionFree

Correct answer: C

Velocity after 5 sec,

v = u – gt = 100 – 10 × 5 = 50 m/s

By conservation of momentum

1 × 50 = 0.4 × (–25) + 0.6 × v'

60 = 0.6 × v' ⇒\Rightarrow⇒ v' = 100 m/s upwards

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