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An object of mass 5kg falls from rest through a vertical distance of 20m and reaches a velocity of 10m/s.

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An object of mass 5kg falls from rest through a vertical distance of 20m and reaches a velocity of 10m/s. How much work is done by the push of the air on the object? (g = 10m/s2) -

(A) 350 J 

(B) 750 J 

(C) 200 J 

(D) 300 J

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1 Answer

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Best answer

Correct option (B) 750J

Explanation:

Using work energy theorem.

Wg + WF = KF – Kini 

1000 + WF = 250 

WF = – 750J

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