Q. 3. What is the work to be done to increase the velocity of a body from
10 m/sec to 15 m/sec if mass of the body is 100 kg?
Answers
Answered by
11
Answer:
Initial velocity u = 30 km/h = 30 × 518 = 253 m/s Final velocity v = 60 km/h = 60 × 518 = 503 m/s Mass m = 1500 kg Work done W = 12mv^2 - 12mu^2
Explanation:
Answered by
9
Answer:
Explanation:
Given,
Initial velocity of the body, u = 10 m/s
Final velocity of the body, v = 15 m/s
Mass of the body, m = 100 kg
To Find,
Work done, w
Formula to be used,
Work done, w = 1/2 × mv² - 1/2 × mu²
Solution,
Putting all the values, we get
w = 1/2 × mv² - 1/2 × mu²
⇒ w = 1/2 × 100 × (15)² - 1/2 × 100 × (10)²
⇒ w = 1/2 × 100 × 225 - 1/2 × 100 × 100
⇒ w = 11250 - 5000
⇒ w = 6250 J
Hence, the workdone is 6250 J.
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