A bullet of mass 20 g is moving with the velocity of 400m/s. calculate its K.E.
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Given, mass of the bullet, m = 20g = 0.02kg ;
initial velocity of the bullet, u = 500m/s ;
final velocity of the bullet, v = 400m/s
Work done by the tree against the bullet,
Wtree = 1/2 mv² − 1/2 mv² = 1/2 m(v² −u² )
= 1/2 (0.02)[(400)² − (500)² ] = −900J
Work done by the bullet, Wbullet = −Wtree
or Wbullet = −( −900J ) = 900J
Hope it helps you!!
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