A Bullet of mass 0.04kg moving with a speed of 90m/s enters a heavy wooden block and is stopped after a distance of 60cm. what is the average resistive force exerted by the block
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Answered by
2
Hey, The answer is 270.
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First, we have to find it's acceleration
v^2 = u^2 + 2 as
v = 0; u = 90 m/s ; s = 0.6 m (60 cm)
0 = (90)^2 + 2 × a × 0.6
0 = 8100 + 1.2 a
-8100 = 1.2 a
a = - 8100/1.2 = -6750 m/s^2
average resistive force exerted by the block on bullet =?
= mass × acceleration
= 0.04 kg × -6750 m/s^2
= 270 N (avg. only)
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Answered by
3
Answer:
270
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