- #1
hawkeye1029
- 38
- 1
Homework Statement
A bridge rises 321 m above the water. Supposed Jack kicks the rock horizontally off the bridge. The magnitude of the rock's horizontal displacement is 45.0 m. Find the speed at which the rock was kicked.
Homework Equations
Kinematics I think?
v = vo + at
Δx = vot + 0.5at2
v2 = vo2 + 2aΔx
The Attempt at a Solution
Well, to start off I tried to divide it into x and y components:
x direction
vo = ?
v = ?
Δx = 45
a = 0
t = ? t found: 8.09 sec
y direction
vo = 0
v = ?
Δx = 321 m
a = 9.8 m/s2
t = ? t found: 8.09 sec
So then I tried finding t (which would be the same for both):
321= 0.5(9.8)t2
t = 8.09
But what to do know? What would be the initial velocity of the rock?
Please help, thanks everyone!