Arubber ball is dropped and bounces vertically from a horizontal concrete floor. if the ball has a speed of 3 m/s just before striking the floor, and a speed of 6.5 m/s just after bouncing, find the average force of the floor on the ball. assume that the ball is in contact with the floor for 0.32 s, and that the mass of the ball is 0.42 kg

F=12.5N

Explanation:

Net force = rate of change of momentum

so find the change of momentum P

Pdown

Pup

dP = change in P

so

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the cellphone, they would then know if the killer would have contacted them or always hated them. or if it was a breakup. but if that is not the case, then it would be the clothing. to put in a bullet, it would have to be put in by hands. hands have finger prints which, would have giving you the answer of who done it.

explanation: