Question

Equal forces are applied for equal time on two bodies of masses m and 2m, initially at rest.
The ratio of kinetic energy of the bodies is-
(A) 1:2
(B) 2:1
(C) 4:1
(D) 1:4
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Answer 1

Explanation:

(A) 1:2

FORCES APPLIED EQUALLY ON m AND 2m

Answer 2

Answer:

4:1

Explanation:

F=ma

thus a=F/m equation- 1

We know

v=u+at equation - 2

putting value of 1 in 2

for Mass 'm'

v =F/m × t

and for maas 2m

v =F/2m×t

Putting this value in 1/2mv^2 for Mass m and 2m

answer comes out to be 4:1