a bullet having mass 10g is fired towards a fixed wooden block with velocity of 30m/s. it comes out of the block with velocity of 20m/s then the total work done by the resistive force is.
1)-4.5j
2)2j
3)-2.5j
4)0
Answers
Answered by
0
bruh i cant answer without 20 characters its 2.5j
Answered by
2
Explanation:
According to law conservation of energy
Energy lost by bullet = Initial KE of bullet - Final KE
=1/2 x 10x10⁻³ x (900 - 400)
= 2.5 J
Since resistive force and velo are in opposite direction
W.D by resistive force = - 2.5 J
Similar questions