Question

(ii) the speed Ans. (i) 7-5 20. How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg m s-12 l2 Ans. 250) f mass 2017​

Answer 1

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Answer 2

Given

Mass (m) = 50g

= 50/1000 kg

= 0.05kg

momentum (p) = 5 kgm/s

initial velocity (u) = 0 m/s

To Find

Workdone

Solution

calculating final velocity :

p = mv

⇒ 50 = (0.05)v

⇒ v = 100 m/s

Work done = ½mv² - ½mu²

⇒ ½mv² - ½(0.05)(0)²

⇒ ½mv²

⇒ ½(0.05)(100)²

⇒ 250 joule