Question

A bullet of 20g is fired from a gun with speed of 10m/s . The kinetic energy of bullet is -
(a) 1 J
(b) 10 J
(c) 20 J
(d) 200 J

Answer 1

1/2mv^2 is the formula...put it and u will get 1 joule as the answer.

Answer 2

we know that

K.E = 1/2 mv^2

So here

K .E = 1/2(0.2) (10)^2 [M = 20g =0.2kg ]

K.E = 10j