A bullet with a mass of 10.0 g and an initial speed of 800 m/s penetrates 5.00 c

Question

A bullet with a mass of 10.0 g and an initial speed of 800 m/s penetrates 5.00 cm into a fixed block of wood before stopping. The average force exerted by the block on the bullet was A) 160 N B) 1.3 x 10^5 N C) 1.3 x 10^3 N D) 6.4 x 10^4 N E) 6.4 x 10^5 N A bullet with a mass of 10.0 g and an initial speed of 800 m/s penetrates 5.00 cm into a fixed block of wood before stopping. The average force exerted by the block on the bullet was A) 160 N B) 1.3 x 10^5 N C) 1.3 x 10^3 N D) 6.4 x 10^4 N E) 6.4 x 10^5 N A) 160 N B) 1.3 x 10^5 N C) 1.3 x 10^3 N D) 6.4 x 10^4 N E) 6.4 x 10^5 N

Explanation / Answer

v^2 = u^2 + 2as

v = 0

u = 800 m/s

s = 5*10^(-2) m

0 = 800^2 - 2*a*0.05

a = 6.4*10^(6) m/s^2

F(avg) = a *m = 6.4*10^(6) * 10*10^(-3)

F(avg) = 64 kilo Newton

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