- #1

- 2

- 0

Problems:

1. I kick a rock horizontally off a ledge that is 20 m high. Once in the air, the rock is in free-fall. How far forward does the rock travel before hitting the ground?

A: I used ΔY=1/2(a)(Δt)^2 to solve for Δt if ΔY = 20m V

_{y,i}= 0 m/s and

a = -9.8 m/s

^{2}. I got Δt ≈ 2.0s. Is it even possible to solve this with the given information?

2. A long-jumper leaves the ground with an initial velocity of 12 m/s at an angle of 28 degrees above the horizontal. Determine the long-jumper's time of flight.

I solved for the y component using V

_{y,i}= Rsinθ and

V

_{x}= Rcosθ. V

_{y,i}= 5.6 m/s and V

_{x}= 10.6 m/s. a = -9.8 m/s^2 but that was as far as I could get with the given information.