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Prove That The velocity of the projectile at any t during its motion is given by v = Square Root (u^2+g^2*t^2-2ugt*Sin Theta)

Prove That


The velocity of the projectile at any t during its motion is given by


v = Square Root (u^2+g^2*t^2-2ugt*Sin Theta)


 

Grade:9

1 Answers

SOURAV MISHRA
37 Points
10 years ago

to prove this qusetion requires simple vector addition.

just imagine that at any instant the net velocity of the projectile is the superposition of two velocities:

1. the projection velocity u inclined at θ to the horizontal.

2. a vertically downward veloctiy equal to gt which a freely falling body would acquire when it has fallen for time t.

the angle between these vectors equals 90° + θ.

so the net velocity at any time comes out to be v = {u2 + g2t2 - 2ugtsinθ}(1/2).

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