Question

A baseball player hits a homerun, and the ball lands in the left field seats, which is 120 m away from the point at which the ball was hit. The ball lands with a velocity of 20 m/s at an angle of 30 degrees below horizontal. Ignoring air resistance
(A) find the initial velocity and the angle above horizontal with which the ball leaves the bat;
(B) find the height of the ball relatively to the ground

Answer 1

If there is no air resistance, the parabolic path will be symmetrical, and thus it will land at the same velocity with which it left. So
\[u=20 m/s and \theta=30\]
The height will be \[h=u ^{2}\sin ^{2}\theta/2g\]

Answer 2

it is like that concept in which when u fire a bullet vertically up,it comes down same straight line to hit u with same speed with which it went if not for air drag

Answer 3

there is a common principle that when a body is thrown up from a certain height,then when it comes back to the same height, it will have the same velocity

Answer 4

sincew the magnitude of velocity is same
however when u see the angle made with the horizontal,first it is theta and next it is 189-theta