Question

calculate the work done required to stop a car of mass 50 kg moving witha velocity of 54 km/h


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Answer 1

✎AnSweR:-

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✠Given:−

✠Given:− ⟹Mass of the car is 50kg.

✠Given:− ⟹Mass of the car is 50kg.⟹Initial Velocity is 54km/h.

✠Given:− ⟹Mass of the car is 50kg.⟹Initial Velocity is 54km/h.

✠Given:−

⟹Mass of the car is 50kg.⟹Initial Velocity is 54km/h.

✠To Find:−

⟹The work done to stop working of the car.

✠Answer:−

We will use Work Energy Theorem to find the work done , according to which work done is equal to the change in the Kinetic energy i.e. ∆ K.E. Since the car will be stopped the final Velocity will be 0m/s.According to Work Energy Theorem:−

:⟹Work Done=ΔEnergy

:⟹Work Done=ΔEnergy Kinetic energy.

:⟹Work Done= 2 mv 2 − 21 mu 2

:⟹Work Done=25kg[0m 2 /s 2 −(15m/s) 2]

:⟹Work Done=25kg×−225m

∴Hence the work done is -5625 Joules .

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Explanation:

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Answer 2

Refer to the attachment..