A. h = 0.5g*t^2 = 0.7 m.
4.9t^2 = 0.7
t^2 = 0.1429
Tf = 0.378 s. = Fall time.
B. Dx = Xo*Tf = 1 m
Xo * 0.378 = 1
Xo = 1/0.378 = 2.65 m/s. = Initial hor.
velocity.
C Exercise 3.57
In laboratory situations, a projectile’s range can be used to determine its speed. To see how this is done, suppose a ball rolls off a horizontal table and lands 1m out from the edge of the table.
Part A
If the tabletop is 70cm above the floor, determine the time the ball is in the air.
Express your answer using two significant figures.
t =
0.38
s
Part B
Determine the ball's speed as it left the table top.
Express your answer using two significant figures.
v =
1.84
m/s
cant figure out part b
1 answer
1 answer