Question

A tennis ball is thrown vertically upward with an initial velocity of +1.6 m/s. What will the ball's speed after 2 s?

A -23 m/s
B -10 m/s
C -18 m/s
D -9 m/s

Answer 1

Answer: C -18 m/s

Step-by-step explanation:

This problem is related to vertical motion and the equation that is useful for this situation is:

`V=V_(o)-gt`

Where:

`V` is the final velocity of the tennis ball at 2 s

`V_(o)=1.6 m/s` is the initial velocity of the tennis ball (directed upwards)

`t=2s` is the time

`g=9.8 m/s^(2)` is the constant acceleration due to gravity

`V=1.6 m/s-(9.8 m/s^(2))(2 s)`

`V=-18 m/s` This is the final velocity of the ball at
`t=2s` (directed downwards)