Homework Help: Projectile motion with two objects

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1. Oct 11, 2016

OccamsRazor1

1. The problem statement, all variables and given/known data
A flying shot glass hits a bottle of whisky behind the bar and topples it. The shot glass bounces off the bottle and lands some distance away, while the bottle falls off the shelf with a much smaller horizontal velocity.

Shotglass lands 2.4m from where it originally hit the bottle. The bottle is propelled sideways off the shelf at a velocity 1.2m/s. Both objects start from a height of 0.8m

a)How long are the shot glass and whisky bottle in the air?
b)What is the horizontal velocity of the shot glass after it leaves the whisky bottle?
c)How far does the whisky bottle land horizontally from the shelf?

2. Relevant equations (What I think are the relevant equations)

v_f+v_i=2d/t
d=1/2at^2+v_i(t)

3. The attempt at a solution
a) v_f=0, v_i=1.2m/s
v_i=2d/t
1.2m/s=2(2.4m)/t
t=2d/v_i
t=4.8m/1.2m/s=4.0s

b) :(

c) :(

Last edited: Oct 11, 2016
2. Oct 11, 2016

Staff: Mentor

Hi OccamsRazor1, Welcome to Physics Forums.

Can you give some details about your attempt for part (a)? It looks to me like you're mixing data from the two different projectiles.

Did you draw and label a sketch of the scenario?