Question

1.) Physics Problem Solving

a.) A busy chipmunk runs back and forth along a straight line of acorns that has been set out between its burrow and a nearby tree. At some instant, it moves with a velocity of −1.43 m/s. Then, 2.03 s later, it moves with a velocity of 1.55 m/s. What is the chipmunk's average acceleration during the 2.03 s time interval?

b.) In April 1974, Steve Prefontaine completed a 10 km race in a time of 27 min, 43.6 s. Suppose "Pre" was at the 8.41 km mark at a time of 25.0 min. If he accelerated for 60 s and then maintained his increased speed for the remainder of the race, calculate his acceleration over the 60 s interval. Assume his instantaneous speed at the 8.41 km mark was the same as his overall average speed up to that time.

Answer 1