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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Explanation:

Solution:

Mass of the car = 1500 kg

Velocity = 60 km/hr = 60 x 5/18 = 16.67 m/s

The car is in motion, so its energy = kinetic energy = 1 /2 mv2

= 1 /2 (1500) ( 16.67)2 J

= 1/ 2 × (1500) × 277.88 J

= 208416.7 J

The kinetic energy of the car, when it comes to rest = 0 J

Work done on object = change in kinetic energy

= 208416.7 – 0

= 208.17

Hence, the work required to stop the car is 208J

Answer 2

Refer to the attachment...