Question

if the speed of a driver on entering the water decreases by half, by how much will his kinetic energy decrease?

Answer 1

We know the formula for Kinetic energy = 1/2 mv^2

If the speed of a driver on entering the water decreases by half i.e Final speed becomes v/2

KE new = 1/2m(v/2)^2 = 1/2m×(v^2/4)

i.e 1/4th of the initial kinetic energy.

Therefore the final kinetic energy would be 1/4th i.e 25% of the initial kinetic energy.

Hence it will decrease by 75%.

Answer 2

Answer:

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{ 0 M E \|0 | N

Explanation:

Therefore the final kinetic energy would be 1/4th i.e 25% of the initial kinetic energy. Hence it will decrease by 75%.