Question

1.
Atennis ball is shot straight up with an initial velocity of 34 m/s. What is its velocity two seconds after launch?

Answer 1

Answer:

The speed (magnitude of the velocity) is 14.4 m/s

Explanation:

Vertical Launch Upwards

It occurs when an object is launched vertically up without taking into consideration any kind of friction with the air.

If vo is the initial speed and g is the acceleration of gravity, the speed vf at any time is calculated by:

$v_f=v_o-g.t$

A tennis ball is launched vertically up with an initial speed of vo=34 m/s. At time t=2 s, its speed is:

$v_f=34-9.8*2$

$v_f=34-19.6$

$v_f=14.4\ m/s$

The speed (magnitude of the velocity) is 14.4 m/s