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A particle is fired vertically upwards with a speed of 15km/s. Find the speed of the particle when it goes out of gravitational pull of earth.

A particle is fired vertically upwards with a speed of 15km/s. Find the speed of the particle when it goes out of gravitational pull of earth.

Grade:11

1 Answers

Swapnil Saxena
102 Points
9 years ago

When it goes out of the gravitational force of the earth , thn Its Kinetic Enegry is 1/2 m (V)2 - U where V is Its initail velocity and U is the gravitational potential enegy of the particles againgt earths gravitation

Now, its velocity can be decuced by the following method :

1/2 m (Vnew)2=1/2 m (Vorg)2 - GMm/r

 (Vnew)2= (Vorg)2 - GM/2r

Vnew = ((Vorg)2 - GM/2r)1/2

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