Arock is dropped from a height of 2.5 meters. what is its velocity when it reaches the ground?
a.3.5 meters/second
b.7.0 meters/second
c.12 meters/second
d.14 meters/second
e.49 meters/second

Within a pendulum, as potential energy decreases, energy increases. a. heat b. kinetic c. frictional d. gravitational

What’s #16 asking and how do i solve it?

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.