A baseball player hits a foul ball straight up into the air. It leaves the bat w

Question

A baseball player hits a foul ball straight up into the air. It leaves the bat with a speed of 27.71 m/s. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it? A stone is dropped from the top of a cliff. It hits the ground below after 3.55 s. How high is the cliff? A ballplayer catches a ball 1.21 s after throwing it vertically upward. With what speed did he throw it? A ballplayer catches a ball 1.74 s after throwing it vertically upward. What height did it reach? A helicopter is ascending vertically with a speed of 5.88 m/s. At a height of 135.99 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?

Explanation / Answer

(10. In the absence of the air resistance,

required speed of the ball = speed of the ball when it leaves the bat

= 27.71 m/s

(2). t= 3.55 s

We know from the relation S = ut +(1/2)gt 2

S = (1/2)gt 2 Since initial speed u = 0

= 0.5 x 9.8 x3.55 2

= 61.75 m

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