1. A bal was dropped from a building and reached the ground in 3s. Show the squa

Question

1. A bal was dropped from a building and reached the ground in 3s. Show the squations that you use and all calculation to get credit. a) How much was the height of the building? b) How fast will it be going when it hits the ground? c) How much is the acceleration of the ball? Explain up and it takes 5 seconds to reach maximum height. Show the equation A ball is thrown that you use to get credit. a) How fast was it going when I threw it? 2. b) How high up did it go? d) What was the acceleration (magnitude and direction) of the ball going up? Explain. e) What was the acceleration (magnitude and direction) of the ball going down? Explain. f0 When was the ball speeding up and slowing down? Explain.

Explanation / Answer

1) a)

from the equation

y = ut+1/2at^2

u = 0

y = 1/2*9.8*3^2 = 44.1 m

b) v = u+at

v = 9.8*3 = 29.4 m/s

c) a = g = 9.8 m/s^2

2) a) from the equation v = u+at

v = 0

u = 9.8*5 = 49 m/s

b) h = u^2/2g = 49^2/2*9.8 = 122.5 m

d) a = 9.8 m/s^2 and direction is vertcally downwards

ce) a = 9.8 m/s^2 and direction downwards

f) when the ball is moving upwards then it is sppeding down

when the ball is moving dowards then speeding up

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