HW for Thursday

1.  Consider a car starting from rest.  If it has an acceleration of 4 m/s/s, find the following:

a.  how fast the car is moving after 7 seconds
b.  how far the car has gone in this time

2.  Consider a falling object, subject only to gravity (a = 9.8 m/s/s, with no air resistance).

a.  How fast is a falling ball moving after 3 seconds of freefall?
b.  How far will it have fallen in this time?

3. If a ball is dropped from 15 m, how long does it take to hit the ground?  Assume that the acceleration is due only to gravity and that there is no air resistance.

4.  Consider a baseball pitch, starting from rest and accelerating up to 45 m/s in a 0.5 m pitching arc.  Find:

a.  the acceleration of the ball
b.  the time that the pitcher is in contact with the ball

5.  Try this:  Derive a "5th equation of motion," in which initial velocity (Vi) is absent.

ALSO - WE WILL HAVE A QUIZ IN 2 CLASSES.  Units, unit conversions, speed....