Question

A body of mass 2 kg, initially at rest, is moved through
3 m along the horizontal by a force of 10 N acting at an
angle of60° with the horizontal. The kinetic energy gained
by the body is
(a) 15 J
(b) 20 J
(c) 25 J
(d) 30 K
​

Answer 1

Answer:

I think it is 20 because formula of ki netik energy is 1/2 m v 2

Answer 2

Answer:15J

Explanation: m=2kg

U=0

s=3m

F=10N

¤=60^•

F=ma

10=2a

a=5m/s^2

V^2=U^2+2as

V^2=2as

V^2=30 m/s

WD =1/2mv^2*cos¤

=1/2*2*30*1/2

WD=15J