Physics, asked by Anjalishankhwar, 3 months ago

2.

The Mass of a car is 1500 kg. How much work is required to be done on it to make it move with a speed of 72 km/h?

(A) 30 x 10^5 J

(B) 3 x 10^5 J

(C) 1.6 x10^6 J

(D) 30 x 10^6 J​

Answers

Answered by Anonymous
2

Explanation:

Answer in the attachment

Attachments:
Answered by nirman95
3

Given:

The Mass of a car is 1500 kg.

To find:

Work is required to be done on it to make it move with a speed of 72 km/h?

Calculation:

72 km/hr = 72 × (5/18) = 20 m/s.

According to WORK-ENERGY theorem, the work done by the force will be equal to the change in Kinetic Energy of the object.

 \therefore \: W = \Delta KE

 \implies \: W =  \dfrac{1}{2} m {v}^{2}  -  \dfrac{1}{2} m {u}^{2}

 \implies \: W =  \dfrac{1}{2} m {(20)}^{2}  -  \dfrac{1}{2} m {(0)}^{2}

 \implies \: W =  \dfrac{1}{2} m {(20)}^{2}  -  0

 \implies \: W =  \dfrac{400}{2} m

 \implies \: W =  200 \times m

 \implies \: W =  200 \times 1500

 \implies \: W =  300000

 \implies \: W =  3 \times  {10}^{5}  \: joule

So, work done is 3 × 10 Joules

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