Question

A body have 4kg mass and its velocity 5m/s and how many work will be done to make a velocity of 10m/s

Answer 1

Answer:

Work done is equal to change in kinetic energy.

Change in kinetic energy= 1/2 * 4 *(10-5)

                            = 10 J

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Answer 2

Answer:

50J

Explanation:

m = 4 kg

v1 = 5 m/s

v2 = 10 m/s

Δv = v2 - v1

Δv = 10 - 5 = 5 m/s

As we know,

W = ΔK.E.

W = 1/2 mΔv²

W = 1/2 (4) (5)²

W = 2(25)

W = 50J