You would need to know how fast you threw the ball in the air once that then multiply the seeped and the time to get your answer<span />
1. What is the skydiver's acceleration?
Initially, like any falling object, a skydiver's downward acceleration is 9.8 meters/seconds^2, or about 28-35 feet per second squared. This acceleration reduces over a few seconds and approaches zero as the skydiver reaches terminal velocity.
<u>Answer:</u>
2.39 kg
<u>Explanation:</u>
There is conservation of momentum here in this problem so we will use the following problem:

where the mass of the student
is 48.5 kg,
the mass of the skateboard
is
kg,
the initial speed of the student
is 4.25 m/s; and
the speed of the student and skateboard
is 4.05 m/s.
So substituting the given values in the above formula to get:





Therefore, the mass of the skateboard is 2.39 kg.