22. kerry klutz drops her physics book off her aunt’s high rise balcony. it hits the ground below 1.5 s later. a. with what speed does it hit? b. how high is the balcony (ignore air drag).

Part (a) v = 14.7 m/s

Part (b) h = 11.025 m

Explanation:

Part (i)

As we know that book is moving under constant acceleration which is due to gravity

so here we know that

so here we will have

Part (b)

height of balcony can be found by another kinematics equation

the answer would be c

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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