A bullet of mass 10 g moving at 300 m/s penetrates 10 cm into a wooden block. Average resistive force is MCQ with Answer and Explanation

A bullet of mass 10 g moving at 300 m/s penetrates 10 cm into a wooden block. Average resistive force is
A. 3000 N
B. 9000 N
C. 4500 N
D. 1500 N
Answer: Option C
Solution (By JKSSB Mock Tests)
KE lost = ½ m v² = ½×0.01×90000 = 450 J. Work = F×s => 450 = F×0.1 => F = 4500 N.

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Question #1
An iron sphere of mass 10 kg has same diameter as an aluminium sphere of mass 3.5 kg. Both fall from rest in vacuum. Which hits ground first?
A. Aluminium sphere
B. Iron sphere
C. Both together
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Correct Answer: Option C


Explanation:
In vacuum, no air resistance, all bodies fall with same g. Galileo's law. Mass independent.

This question belongs to: Science Physics
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A car moving at 36 km/h is brought to rest in 2 s. Deceleration is
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B. 2.5 m/s²
C. 18 m/s²
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Correct Answer: Option A


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Correct Answer: Option A


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