Question

A car of mass 1 ton moving with a velocity of
90 km/h is brought to rest in 20S. What is the
brake power?​

Answer 1

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A car of mass 1 ton moving with a velocity of 90 km/h is brought to rest in 20S. What is the brake power?

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Given,

Mass = 1 ton = 907.18 kg

Velocity = 90 km / hr

= 90 km / hr * 1000 / 3600

= 25 m / sec

Time = 20 sec

We know,

Power = Work done / Time

P = W / t

Also,

Work Done = Force * Displacement

W = F * s

P = F * s / t

We also know,

Force = mass * Velocity

F = m * v

P = m * v * ( s / t )

Also,

Velocity = Displacement / time

V = s / t

P = m * v * v

P = m * v²

P = 907.18 * ( 25 )²

P = 907.18 * 625

P = 566987.5 W

P = 566.9875 kW

P = 566.99 kW

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Answer 2

hey this is your answer

12500 Newton opposite to the direction of motion of car is the force

wka.

power = work done/time

so power = -312.5 kw (here)

means 312.5 kw opposite to the direction of motion of car

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