Question 48: Laws of Motion

Question

A bullet of mass 0.1 kg is fired on a wooden block to pierce through it, but it stops after moving a distance of 50 cm into it. If the velocity of bullet before hitting the wood is 10 m/s and it slows down with uniform deceleration, then the magnitude of effective retarding force on the bullet is 'x' N. The value of 'x' to the nearest integer is __________.

Accepted Answer

M
bullet
= 0.1 kg
V
2
= 4
4
+ 2($$-$$a) $$	imes$$ 5
$$ \Rightarrow $$ 0 = (10)
2
$$-$$ 2a $$	imes$$ (0.5)
Retardation $$(a) = {{1000} \over {2 	imes 5}}$$ = 100 m/s
2
Retarding force (F) = ma = 0.1 $$	imes$$ 100
F
R
= 10 N

Laws of Motion

Integer / Numeric Answer Type