Question

A body of mass m moving with velocity v has a kinetic energy K. If its velocity is increased by 25%, what will be the work done in terms of K.E?
a) Zero
b) 2.5 K
c) 0.56 K
d) 0.25 K​

Answer 1

Answer:

I think it's is 2.5 K I don't know the answer but I think it's only

Answer 2

Answer:

0.56 k

Explanation:

K.E=0.5 mv^2

now v increase by 25% so

new velocity v2=0.5 m (25/100 v)

v2=5/4 v or 1.25v

so new K.E = 0.5m (1.25v)^2 = 0.5m (1.5625 v^2)

SO

        New K.E= 1.5625 (0.5 mv^2)

                               = 1.5625 K

so change in K.E= new - original

                           = 1.5625-1

                           = 0.56 K