Andy throws a tennis ball horizontally from a building at point A,15 m above the

Question

Andy throws a tennis ball horizontally from a building at point A,15 m above the ground. The ball lands on the ground at point B, adistance 20 m from the base of the building. Ignore air resistance. A) What is the acceleration of the ball just before it hitsthe ground? B) How long does the ball stay in the air?
C) What is the velocity (magnitude and direction) of the ballat point A? D) Find the velocity components of the ball at point B, justbefore it hits the ground. A) What is the acceleration of the ball just before it hitsthe ground? B) How long does the ball stay in the air?
C) What is the velocity (magnitude and direction) of the ballat point A? D) Find the velocity components of the ball at point B, justbefore it hits the ground.

Explanation / Answer

The acceleration is acceleration due to gravity in thevertical direction that is g. h=ut+1/2*gt2 15=1/2*g*t2 From this we get the time taken by it. The initial vertical velocity is vy=0 and horizontal velocityis given by s=vx*t 20=vx*t From this we get the vvelocity of it. Its vertical velocity at point B as v-u=gt vy=gt Its horizontal velocity vx remains the same as. From this we get horizontal and vertical components byit. Hence we get by it. From this we get the time taken by it. The initial vertical velocity is vy=0 and horizontal velocityis given by s=vx*t 20=vx*t From this we get the vvelocity of it. Its vertical velocity at point B as v-u=gt vy=gt Its horizontal velocity vx remains the same as. From this we get horizontal and vertical components byit. Hence we get by it.

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