Physics help needed

This looks very like a homework question. While people on this site don't mind giving advice, they generally don't like doing people's homework for them. So here's some tips. Looks like very basic physics, so I'd suggest all conditions will be ideal ie, no friction or air resistance.
Draw diagrams of the problems.
Force (Newtons) = Mass (kg) * acceleration (m/s^2)

Acceleration due to gravity is 9.8m/s^2

v=u + at
v (final velocity-m/s)
u (initial velocity- m/s)
a (acceleration)
t (time)

There should be enough information there for you to work out the answers. At least have a go, and post what you worked out. It's been a couple of years, so I don't know if I can do even this simple stuff any more, but if not myself, someone here will be able to do it.

I think I may have figured one out.. does this make sense?
3. Tim, mass 42.00 kg, is riding a skateboard, mass 2.00 kg, traveling at 1.20 m/s. Tim jumps off and the skateboard stops dead in its tracks. In what direction and with what velocity did he jump?
-->I think that this problem has to do with conservation of momentum, and that I can apply the formula m1v1=-m2v2. (42.00 kg) (v1)= -(2.00 kg) (1.20 m/s)---> (42.00 kg) (v1)=-2.4 kg-m/s--> v1=-.06 m/s. **Tim jumps in the negative direction .06 m/s. Is that right? I feel like there's something more to it that I'm missing.

I just got out of bed and have got to go to work. I'll check in this arvo.

1. I'm assuming that the 2 masses are joined. The acceleration will be due solely to gravity. ie, 9.8 m/s^2.

Have to think about the next two.