Name
Phys 2010 (NSCC), Spring 2007
Problem Set #3
1. A particle moving in two dimensions has an initial velocity in the +xdirection, with
initial speed 20.0m
s(so v0x=20.0m
s,v0y= 0). It undergoes a constant acceleration with
ax= 0 and ay=−6.0m
s2. What is the speed of the particle at t=4.0s?
(Recall the definition of speed: v=qv2
x+v2
y.)
50.0 m
v = 25 m/s
2. A car drives straight off the edge of a cliff
that is 50 m high with a speed of 25.0m
s(Its
initial velocity is completely horizontal .) How
long did the car spend in falling? (Use the y
equation of motion.)
1
