Make sure to show all work in complete detail. NO CREDIT will be given if no work is shown!!!

time limit is 15 mins

Name:__________________
Physics 4A/Fall 2020
Quiz 1
Make sure to show all work in complete detail. NO CREDIT will be given if no work is shown!!!

1. a) A toy car goes up a hill of length L at constant speed of 3 mi/h and returns down the
hill at 6 mi/h. Calculate the average speed for the round trip in mi/h. Do not assume a
numerical value for L! (6 pts)
2. Using similar derivations as on the online notes for the Kinematic Equations of Motion
for constant acceleration, derive the following two kinematic equations:
a) 0 v v at = + (3 pts)
b) 0 ( ) 1
2 o x x v vt =+ + (3 pts)
3. Is the magnitude of Vave equal to Save ? Explain! (2 pts)
4. A particle is moving along the x-axis. At t = 0 s it is moving toward the negative X
direction while it is slowing down. At t = 4 s the particle passes through the origin with
zero velocity. At t = 4 s the particle changes direction and begins to move toward the
positive X direction with increasing speed. The particle reaches its maximum speed at
t = 7 s.
a) Draw the graph of v vs. t . (3 pts)
b) Draw the graph of x vs. t . (3 pts)

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