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bixtya [17]
3 years ago
14

A baseball is hit so that it travels straight upward after being struck by the bat. A fan observes that it takes 2.90 seconds fo

r the ball to reach its maximum height. a) Find the balls initial velocity b) Find the height it reaches
Physics
1 answer:
Natasha_Volkova [10]3 years ago
4 0
We'll assume that the whole scene takes place on Earth.
So the acceleration of gravity is 9.8 m/s² downward.

a).  Gravity makes anything fall 9.8 m/s faster every second.
That's the same thing as rising 9.8 m/s slower every second.

If it takes 2.9 seconds to reach its maximum height, then
it must have started out rising at (9.8 x 2.9) = 28.4 m/s.

b).  The ball left the bat at 28.4 m/s.
After 2.9 seconds, its speed was zero. (That's why it started falling.)
It's average speed during the climb was

                 1/2 (28.4 + 0)  =  14.2 m/s .

It rose straight up at an average speed of 14.2 m/s for 2.9 seconds,
so it reached a maximum  height of

                 (14.2 x 2.9)  =   41.2 meters    .   
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