Answer:
The speed with which just after he grabs her is 2.68 m/s.
Explanation:
Given that,
Mass of Erica, m = 38 m/s
Mass of Danny, m' = 46 kg
Erica reaches the high point of her bounce, Danny is moving upward past her at 4.9 m/s. At this moment, the initial speed of Erica will be 0. The momentum will remain conserved. Using the conservation of linear momentum as :

So, the speed with which just after he grabs her is 2.68 m/s. Hence, this is the required solution.
Answer: I don't know you But i am proud good job
fun game isn't it xD
Explanation:
D. The measure of average kinetic energy of molecules of a substance
The difference between them is that
velocity is the speed with a direction, whereas speed does not have a direction.
Dependant variable is something which you MEASURE during an experiment
So your answer would be : B