Question

10
6.
यदि किसी कार का द्रव्यमान 1500 kg है तो उसके वेग को 30 km/h से
60 km/h तक बढ़ाने में कितना कार्य करना पड़ेगा?
What is the work to be done to increase the velocity of a car fro
30 km/h to 60 km/h if the mass of the car is 1500 kg?
A.156250J
B.625000J
C.625000
D.25000J
A A​

Answer 1

Answer:

1234567890

Explanation:

1234567890

Answer 2

Answer:

Explanation:

⏩ * Mass of the car, m= 1500 kg,

* Initial velocity of the car, u= 30 km/h

= 30×1000m/3600s = 25/3 m s^-1

* Final velocity of the car, v= 60 km/h

= 60 × 1000m/3600s = 50/3 m s^-1

Work done on the car = Increase in Kinetic energy of the car

= Final K.E. - Initial K.E.

= 1/2 m (v² - u²)

= 1/2 × 1500 [(50/3)² - (25/3)²] J

= 1/2 × 1500 [50/3 + 25/3 ][50/3 - 25/3] J

= 1500/2 × 75/3 × 25/3 J

= 156250 J. Ans.

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