Question

A bullect with the speed 150m/s penetrates 3.2cm what is the retardation

Answer 1

$\textbf{ \underline{ Hello Mate! }}$

Initial speed ( u ) = 150 m/s

Final speed ( v ) = 0

Distance of penetration = 3.2 cm

Converting it into m we get 0.032 m

${v}^{2} - {u}^{2} = 2as \\ 0 - {(150)}^{2} = 2a(0.032) \\ - 22500 = 0.064a \\ - 351,562.5 = a$
But if you mean by 3.2 m and not cm then

$0 - {(150)}^{2} = 2a(3.2) \\ - 22500 = 6.4a \\ - 3,515.625 = a$

$\textbf{ Have great future ahead! }$