Name: Signature Pre lab Questions. at the beginning of the lab to end of the lab

Question

Name: Signature Pre lab Questions. at the beginning of the lab to end of the lab would result in not getting any eredit for the pre lab. Answer these questions before coming to the lab and tura in your answer get credit. Waiting to turn in this pre lab question sheet at the 1. A ball was dropped from a building and reached the ground in 3s Show the squations 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 2. A ball is thrown up and it takes 5 seconds to reach maximum height. Show the equation to a) How fast was it going when I threw it? 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. f) When was the ball speeding up and slowing down? Explain.

Explanation / Answer

t = 3 s

initial velocity u = 0

acceleration g = 9.8 m/s2

height h

using second equation of motion

h = ut +(1/2)gt2

h = 0 + 0.5(9.8)(3)2

h = 44.1 m

b) using first equation of motion

v = u + gt

v = 0 + (9.8)(3)

v = 29.4 m/s

speed when it hits the ground is 29.4 m/s

c) acceleration of the ball is g=9.8 m/s2

2)

t = 5 s

v = 0

g = 9.8 m/s2

initial velocity u

a) using first equation of motion for upward motion

v = u - gt

0 = u - (9.8)(5)

u = 49 m/s

b)

usning second equation of motion we get

h = ut - (1/2)gt2

h = 49(5) - 0.5(9.8)52

h = 122.5 m

d) the acceleration of ball going up was g = - 9.8 m/s2 because only force(acceleration) acting is gravity

e) the acceleration of ball going down was g = 9.8 m/s2 because only force(acceleration) acting is gravity

f) the ball was slowing down when going up and speeding while going down

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