Author Question: At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 20.0 m/s. How much later ... (Read 130 times)

altibaby · **on:** Jul 28, 2018

At the top of a cliff 100 m high, Raoul throws a rock upward with velocity 20.0 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. 5.05 s
c. 2.48 s
b. 3.76 s
d. 1.78 s

Question 2

Human reaction time is usually about 0.20 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. 4.0 cm.
c. 16 cm.
b. 9.8 cm.
d. 20 cm.