Question

calculate the work required to be done to stop a car of 1500kg moving at a velocity of 60km per hour​

Answer 1

Solution: Kinetic energy, E k= 1/2 mv^2

Where,

Mass of car, m= 1500 kg

Velocity of car, v= 60 km/hr= (60 — 5 )/(18 ms^(-1) )

ˆ´ E k= 1/2 — 1500 — €–(60 — 5/18)€—^2 = 20.8 —€–10€—^4 J

Hence, 20.8 — 104 J of work is required to stop the car.

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Answer 2

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Kinetic energy, E k= 1/2 mv^2

Where,

Mass of car, m= 1500 kg

Velocity of car, v= 60 km/hr= (60 — 5 )/(18 ms^(-1) )

ˆ´ E k= 1/2 — 1500 — €–(60 — 5/18)€—^2 = 20.8 —€–10€—^4 J

• Hence, 20.8 — 104 J of work is required to stop the car.

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