Question

A ball is thrown vertically upward from the ground with a velocity of 30m/s.

a. How long will it rise to its highest point?

b. How high does the ball rise?

c. How long after it was thrown will the ball return to the ground?

Answer 1

a)

$$t=\frac{v}{g}=\frac{30}{9.8}=3.06\ s$$

b)

$$h=\frac{v^2}{2g}=\frac{30^2}{2\cdot9.8}=45.9\ m$$

c)

$$T=2t=2\frac{v}{g}=2\frac{30}{9.8}=6.12\ s$$