Question

the mass and velocity of a body is 'm' and 'n' respectively. if mass is half and velocity if 4 times find the kinetic energy.​

Answer 1

Answer:

The kinetic energy is m x n .

the formula used to find k.e = 1/2mv^2.

given that :

mass = m

velocity = n

but here the mass is reduced to half and velocity is increased by 4 times

BY PROBLEM

= 1/2mv^2

= 1/2 x 1/2 x m x 4 x n

= 1/4 x m x 4 x n

=1/4 x 4mn

= mn

if it helps you thank me .

mark correct brainliest

Answer 2

Answer:

KE becomes 8 times

Explanation:

given the mass=m and velocity=n

then KE is (1/2)mn²  ........(1)

if mass is half i.e.m/2

velocity is 4 times i.e. 4n

we know that KE=1/2mv²

                     KE1=(1/2)×(m/2)×(4n)²

                     KE1=(1/2)×m(1/2)×16n²

                           =(1/2mn²)×(1/2)×16

                     KE1=KE×8            ∵ equation 1

∴KE becomes 8 times