course phy121
A ball rolls off the end of an incline with a vertical velocity of 20 cm/s downward, and a horizontal velocity of 80 cm/s. The ball falls freely to the floor 120 cm below.
For the interval between the end of the ramp and the floor, hat are the ball's initial velocity, displacement and
acceleration in the vertical direction?
v0=20cm/s
`ds=0
a=980cm/s/s
What therefore are its final velocity, displacement, change in velocity and average velocity in the vertical direction?
vF=485.5cm/s
`ds=120cm
`dv=465.5cm/s
vAve=252.75cm/s
What are the ball's acceleration and initial velocity in the horizontal direction, and what is the change in clock time,
during this interval?
Am I to assume that the ball has a constant horizontal velocity or how am I to attain its horizontal acceleration?
What therefore are its displacement, final velocity, average velocity and change in velocity in the horizontal direction
during this interval?
After the instant of impact with the floor, can we expect that the ball will be uniformly accelerated?
Why does this analysis stop at the instant of impact with the floor?
For the projectile problems in this course, unless otherwise specified you can safely assume that the horizontal acceleration is zero.
In any case the time required for the vertical motion applies to both the vertical and the horizontal motion.
This should be enough to allow you to finish the problem, but if not please let me know.