Question

The KE of an object of mass m moving with a velocity of

10 m/s is 30 J. What will be its KE when its velocity is

increased four times?​

Answer 1

Explanation:

K.E=1/2 mv²

=30J = 1/2 m(10)²

=30J = 1/2 m×100

=30J =50m

≈m=30/50

=m=0.6kg

If v= 40

then,K.E=1/2 mv²

=1/2 ×0.6×(40)²

=1/2 ×0.6×1600

=800×0.6

=480 J