This is my question d, e, f. If you don\'t have time, please focus on d and e. T

Question

This is my question d, e, f. If you don't have time, please focus on d and e. Thank guys

A ball is thrown vertically upward. It takes 3s to get back to the hand where it started. What is its velocity immediately after leaving the hand? How high is it reaches the peak?[Ignore air resistance.] State what the sign(+/-/0) of the position, velocity and acceleration are at 3 points-one on the way up, at the peak and on the way down. [Take up to be positive and the hand that throws it to be the reference point.] Sketch and label force diagrams for the three indicated positions(going up, top, on way down.)

Explanation / Answer

d)The ball must reach back with same velocity to the verson

v=u+at

So

-v=v-3g

So

v=3g/2=14.7m/s

e)at top v=0

v^2-u^2=-2gs

So

h=-14.7^2/(-2*9.8)=11.025m

f)at peak : v=0,a=-,position=+

at way up :v=+, a=-, position=+

at way down: v=-,a=-,position=+

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