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10-09-2019
Physics

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a bullet ofmass 0.05kg has a speed of 400m/s.what is its kinetic energy? If it hits a wall of which the averageresistive force is 10000N, calculate the distance penetrated by the bullet

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MathPhys MathPhys

10-09-2019

Answer:

4000 J

0.4 m

Explanation:

Kinetic energy is one half the mass times the square of velocity:

KE = ½ mv²

Given m = 0.05 kg and v = 400 m/s:

KE = ½ (0.05 kg) (400 m/s)²

KE = 4000 J

Work = change in energy

W = ΔKE

Fd = KE

(10000 N) d = 4000 J

d = 0.4 m

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