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Name: Class: 53CNK

Homework 2: Projectile motion and motion along an inclined plane

Assignment Due: Thursday 10/3/2012

Problems Graded: Score: out of Total:

Problem 2.1 [15 pt(s)] A rookie quarterback throws a football with an initial upward velocity component of 16.0 m/s and a horizontal velocity component of 20.0 m/s. Ignore air resistance.
a) How much time is required for the football to reach the highest point of the trajectory? b) How high is this point?
c) How much time (after it is thrown) is required for the football to return to its original level?

Problem 4.3 [20 pt(s)]: Consider the following frictionless system (note that “frictionless” means the ball will slide, not roll) The ball begins moving from rest, 100m up an incline.

| (a)[5 pt(s) ] What is the acceleration along the in- cline? |[pic] | | | | |(b)[10 pt(s) ]How much time does the ball take to reach level | | |ground? | | | | | |(c)[5 pt(s) ]What is the ball’s velocity as it reaches the bottom | | |of the incline? | |

Problem 4.2 [65 pt(s) ] : Consider the following frictionless system (note that “frictionless” means the ball will slide, not roll). The...
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