Physics A Final Review
1. Grace is driving her sports car at 30.0 m/s when a ball rolls out into the street in front
of her. Grace slams on the brakes and comes to a stop in 3.00 seconds. What was the
acceleration of Grace’s car?
2. A car with an initial speed of 23.7 km/h accelerates at a uniform rate of 0.92 m/s2 for
3.6 s. Find the displacement of the car during this time.
3. A parachutist descending at a speed of 10.0 m/s loses a shoe at an altitude of 50.0m.
What is the velocity of the shoe just before it hits the ground? How long does it take
the shoe to reach the ground?
4. Greg Louganis dives off the 3-m springboard and initially bounces up with a velocity
of 8.0 m/s at an angle of 80.00 to the horizontal. What are the horizontal and vertical
components of his velocity?
5. A hot air balloon drifts 25 km in a direction 70.00 north of east. An abrupt change in
air movement then carries the balloon 8.0 km in a direction 40.00 south of east.
Calculate the balloon’s resultant displacement (magnitude and direction).
6. A cannonball is shot horizontally from a cliff 45 m high at 25 m/s. How far away
from the cliff does the cannonball land?
7. A paintball gun fires a ball with a horizontal velocity of 35 m/s. The ball hits a wall
that is 7.0 m from the gun. How far below the level of the gun does the ball hit the
wall?
8. Superman is said to be able to “leap tall buildings in a single bound.” How high a
building could Superman jump over if he were to leave the ground with a speed of
60.0 m/s at an angle of 750 to the horizontal?
9. If a water particle in a stream of water in a fountain takes 0.35 s to travel from spout
to receptacle 2.0 m away, what is the initial velocity and angle when the particle is
shot?
10. A boy is pulling a wagon at an angle of 32.00 above the horizontal with a force of
50.0 N. Find the horizontal (Fx) and the vertical (Fy) components.
11. The forces acting on a sailboat are 390 N north and 180 N east. If the boat (including
crew) has a mass of 270 kg, what are the magnitude and direction of its acceleration?
12. A student moves a box of books down the hall by pulling on a rope attached to the
box. The student pulls with a force of 135 N at an angle of 22.0o above the
horizontal. The box has a mass of 35.0 kg and k between the box and the floor is
0.27. Find the acceleration of the box.
13. A 55 kg ice skater, initially at rest on a flat skating rink, requires a 198 N horizontal
force to be set in motion. However, after the skater is in motion, a horizontal force of
175 N keeps her moving at a constant velocity. Find the coefficients of static (s) and
kinetic friction (k) between the skates and the ice (2 separate problems).
14. A 25.0 kg slides down a 37.0o ramp with an acceleration of 1.50 m/s2. Determine the
coefficient of kinetic friction (k ) between the box and the ramp.
15. Suppose a block with a mass of 10.0 kg is placed on a 50.0o incline plane. If the
coefficient of kinetic friction is 0.330, how much force (FA) is needed to pull the
block up the incline with an acceleration of 3.25 m/s2?
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a = -10.0 m/s2
xf = 30 m or 30. m
vfy = -32.9 m/s and t = 2.34 s
x = 1.4 m/s and y = 7.9 m/s
R = 24 km and  = 520
x = 75 m
yf = - 0.20 m
yf = 170 m
vi = 5.9 m/s or 6.0 m/s and  = 170
Fx = 42.4 N and Fy = 26.5 N
a = 1.6 m/s2 and  = 250 E of N or 650 NE
a = 1.3 m/s2
s = 0.37 and k = 0.32
k = 0.56
FA = 128.4 N