Question

A bullet moving with 10 metre per second hits a wooden plank. The bullet is stopped when it penetrates the plank 2 cm deep . Calculate the retardation of the bullet

Answer 1

Use the equation
v^2 - u^2 = 2*a*s
Thus,
(0)^2 - (10)^2 = 2*a*(0.02)
Since final velocity is zero and all quantities have to be addressed in SI units.

Hence a can be calculated further