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Q.

In oblique projectile motion, the power of the gravitational force 
A) Is negative for first half, zero at top most point and positive for rest half 
B) Varies linearly with time.
 

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a

A is correct , B is incorrect 

b

Both A and B are correct

c

A is incorrect , B is correct

d

Both A and B incorrect. 

answer is A.

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Detailed Solution

(A) P=Fg¯. V¯=FgVcosθ
For the first half, θ is greater than hence p is negative 
At the top most point θ = 90° , hence P=0
For the recand half, θ<900hence P is positive
(B) P=Fg¯V¯=mgj^{ucosi^+(usinθgt)j^}=mg{gtusinθ}

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