A water rocket, launched from the ground, rises vertically with acceleration of 25 m/s2 for 2.0 s when it runs out of fuel. Disregarding air resistance, how high will the rocket rise?
a. 305 m
b. 356 m
c. 178 m
d. 130 m
e. 50 m
[Ques. 2] A basketball player can jump 1.6 m off the hardwood floor. With what upward velocity did he leave the floor?
a. 5.8 m/s
b. 2.8 m/s
c. 5.4 m/s
d. 5.6 m/s
e. 11 m/s
[Ques. 3] Mt. Everest is more than 8 000 m high. How fast would an object be moving if it could free fall to sea level after being released from an 8 000-m elevation? (Ignore air resistance.)
a. 396 m/s
b. 120 m/s
c. 1 200 m/s
d. 12 000 m/s
[Ques. 4] Maria throws two stones from the top edge of a building with a speed of 22 m/s. She throws one straight down and the other straight up. The first one hits the street in a time t1 . How much later is it before the second stone hits?
a. 5.5 s
b. 4.5 s
c. 3.5 s
d. 6.5 s
e. Not enough information is given to work this problem.
[Ques. 5] At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 15.0 m/s. How much later should he drop a second rock from rest so both rocks arrive simultaneously at the bottom of the cliff?
a. 8.08 s
b. 3.31 s
c. 5.02 s
d. 1.78 s
e. 0.89 s
[Ques. 6] Human reaction time is usually about 0.18 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? The nearest value is
a. 32 cm.
b. 88 cm.
c. 1.6 cm.
d. 180 cm.
e. 16 cm.
[Ques. 7] John throws a rock down with speed 11 m/s from the top of a 25-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the rock's speed just as it hits the ground?
a. 19 m/s
b. 25 m/s
c. 610 m/s
d. 22 m/s
e. 12 m/s
[Ques. 8] Gwen releases a rock at rest from the top of a 40-m tower. If g = 9.8 m/s2 and air resistance is negligible, what is the speed of the rock as it hits the ground?
a. 28 m/s
b. 14 m/s
c. 20 m/s
d. 40 m/s
e. 780 m/s
[Ques. 9] Omar throws a rock down with speed 12.5 m/s from the top of a tower. The rock hits the ground after 1.50 s. What is the height of the tower? (air resistance is negligible)
a. 24.0 m
b. 21.0 m
c. 30.0 m
d. 54.0 m
e. 45.0 m
[Ques. 10] A rock, released at rest from the top of a tower, hits the ground after 3.5 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s2 and air resistance is negligible)
a. 34 m/s
b. 17 m/s
c. 44 m/s
d. 68 m/s
e. 24 m/s
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