Question

If the mass of a block is increased four times, find the factor by which its speed should change so that its kinetic energy remains the same

Answer 1

Answer:

The velocity should be decreased by 1/2 times to make K.E same

Explanation:

K.E=1/2mv^2

given m=4m and let v=v/2

substituting

K.E=1/2×4m×(v/2)^2

K.E=1/2×4m×v/4

cancelling

K.E=1/2mv^2