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Question

A 5g bullet was fired horizontally into a 1.2kg wooden block resting on a wooden surface. The coefficient of kinetic friction between the block and surface is 0.2. The bullet remained embedded in block. The block was found to slide 0.23m along the surface before stopping. Find the initial speed of the bullet.

A
241 ms1
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B
229 ms1
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C
221 ms1
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D
202 ms1
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Solution

The correct option is B 229 ms1
Using law of conservation of momentum

v=5v1205=v241 and v2=2as

(v241)2=2×.2×.23×10

v=241×241×.92=229 ms1

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