Solution to problems – class 9 – Set 1 Q 27

Problem Statement

A bullet leaves a rifle with a muzzle velocity of 600 m/s. While accelerating through the barrel of the rifle, the bullet moves a distance of 0.8 m. Determine the acceleration of the bullet (assume a uniform acceleration).

Solution

Initial velocity of the bullet U=0

Final velocity of the bullet = muzzle velocity = V=600 m/s

Distance travelled to acquire the muzzle velocity =S=0.8 m

To find out the acceleration, we will use the equation
V2 = U2 + 2 a S

As U = 0, the equation becomes: V2 = 2 a S


Which gives acceleration

a = V2 / (2 S) = 6002 / (2 x  0.8) = 225000 m/s2

Question Set – Physics Problems for grade 9

Solution to problems – class 9 – Set 1 Q 27
JEE Main 2020
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