Question

A particle does U.C.M. in horizontal plane radius is 20cm. Centripetal force acting is 10N. It's kinetic energy is
a.4J
b.3J
c.2J
d 1J

Answer 1

Answer:

Centripetal force = 10 N

Radius=r=20/100 =1/5 m

now,

mv²/r =10

mv²=10r

mv²=10×1/5

mv²=2

Now, Kinetic energy = 1/2 mv²

1/2 × 2

1 Joule

So, option (d) is correct.