# Homework Help: Help! motion problem

1. Nov 10, 2005

### snowbelle

a plane drops a hamper of medical supplies from a height of 3000m. the plane`s horizontal velocity was 105m/s at the instant the hamper was dropped. acceleration of gravity is 9.8 m/s what is the overall velocity of the hamper at the instant it strikes the surface of the ocean? answer in units of
m/s

I dont get the problem, do I have to find the x component first? then what do I do after?

2. Nov 10, 2005

### BerryBoy

Yes, you can use this to find the downward component of velocity:

v2 = u2 + 2as

Where v = final velocity
u = initial velocity
a = acceleration &
s = displacement

Then use pythagoras for the magnitude of velocity

Regards,
Sam

3. Nov 10, 2005

### daniel_i_l

Remember that the horizontal velocity (x-component) always stays the same if there is no friction in that direction (like in this problem)

4. Nov 10, 2005

### BerryBoy

Oh yeah, I forgot; my answer assumes that there is no air-resistance.

Cheers for the reminder daniel_i_l.

Sam

5. Nov 11, 2005

### snowbelle

thanks so much guys