# Homework Help: Spring and Projectile

1. Oct 22, 2004

### ElectricMile

Calculate vr, the speed of the ball when it leaves the launching ramp. Express the speed of the ball in terms of k, s, m, g, y, and/or H.

i know it will contain m, y and k

also

With what speed will the ball hit the floor? Express the speed of the ball in terms of k, s, m, g, y, and/or H.

i am so confused when it comes to creating these "expressions" i dont even know where to begin or what the heck to do.

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2. Oct 22, 2004

### Pyrrhus

I would use conservation of mechanical energy, of course if there wasn't friction, is the system frictionless?

3. Oct 22, 2004

### ElectricMile

4. Oct 22, 2004

### Pyrrhus

Well imagining there's friction, you could calculate the forces to calculate the initial speed at the bottom of the ram, then friction and gravity will slow down the ball til it hits the top, then just use projectile motion.

5. Oct 22, 2004

### ElectricMile

see, that just blew over my head, im still boggled

6. Oct 22, 2004

### Pyrrhus

Divide the problem in to 3 parts.