Question

What is the work needed to be done to increase the velocity of a car from 30
The sum of the kinetic and notential energies of an object is called its
Kmh-1 to 60 Kmh-1 if the mass of the car is 1500 Kg.​

Answer 1

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The work needed to be done is 156187 J.

Given :

• Initial velocity(u) = 30 km/h = 30 × 5/18 = 25/3 m/s.

• Final velocity(v) = 60 km/h = 60 × 5/18 = 50/3 m/s

• Mass = 1500 kg

To Find :

• Work needed to be done = ?

Solution :

We know the formula to calculate the work done,

So by using it,

➠ Work done = 1/2mv² - 1/2mu²

➠ W = m/2(v²-u²)

➠ W = 1500/2(50/3²-25/3²)

➠ W = 156187 J

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➤ Additional information :

• Work is done when a force that is applied to an object moves that object or body!!

• The work is calculated by multiplying the force by the amount of movement of an object itself !!

• Formula = f × d

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Answer 2

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The work needed to be done is 156187 J.

Given :

Initial velocity(u) = 30 km/h = 30 × 5/18 = 25/3 m/s.

Final velocity(v) = 60 km/h = 60 × 5/18 = 50/3 m/s

Mass = 1500 kg

To Find :

Work needed to be done = ?

Solution :

We know the formula to calculate the work done,

So by using it,

➠ Work done = 1/2mv² - 1/2mu²

➠ W = m/2(v²-u²)

➠ W = 1500/2(50/3²-25/3²)

➠ W = 156187 J

━━━━━━━━━━━━━━━

➤ Additional information :

Work is done when a force that is applied to an object moves that object or body!!

The work is calculated by multiplying the force by the amount of movement of an object itself !!

Formula = f × d

━━━━━━━━━━━━━━━