posted by Piper on .
1. A person runs 800. m at an average speed of 6.00 m/s and then the next 800. m at an average speed of 8.00 m/s. Calculate (a) the total time of travel and (b) the average speed.
2. A boy kicked a can horizontally from a 6.5 m high rock with a speed of 4.0 m/s. How far from the base of the rock the can land?
1. See previous post:Tue,6-17-14,9:52 PM
2. Xo = 4.0 m/s.
h = 0.5g*t^2 = 6.5 m.
4.9*t^2 = 6.5
t^2 = 1.327
Tf = 1.15 s. = Fall time.
d = Xo * Tf = 4.0m/s * 1.15s = 4.60 m.