Solution to problems – class 9 – Set 1 Q 27

Last updated on June 17th, 2019 at 09:12 am

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