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andrewjschoon2876
26.07.2019 •
Physics
Abaseball is hit straight up into the air. if the initial velocity was 20 m/s, how high will the ball go? how long will it be until the catcher catches the ball at the same height it was hit? how fast is it going when catcher catches it?
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Ответ:
For an uniformly accelerated motion, we can use the following relationship:
where h is the maximum height reached by the ball,
2) We can find the time the ball takes to return to the ground by requiring that the space covered by the ball returns to zero:
where for an uniformly accelerated motion,
By solving this, we have two solutions: one is t=0, which corresponds to the moment the player hits the ball, the second one is
so, the ball returns to the ground after 4 s.
3) The velocity of the ball when it returns to the ground is given by:
where the negative sign means the ball is going downwards.
Ответ: