The positive of two cars (labeled T and H) on a straight driveway are graphed. a

Question

The positive of two cars (labeled T and H) on a straight driveway are graphed.
a. Consider the speed of car H. At t=16 sec, is it speeding up, slowing down, or moving with constant speed?
b. is the acceleration of car H positives, negative, or zero at t=16 sec?
c. is the acceleration of car T positive, negative, or zero at t=4 sec?
d. which car is passing the other at t=12 sec?
e. during the time interval shown (t=0s to t=20s), is the average velocity of car H greater than, less than, or equal to the average velocity of cat T?
f. Find the instantaneous velocity of car H at t= 2 sec.

Explanation / Answer

a) the car H is speeding at t = 16 seconds as the slope of the curve is constantly increasingfrom 12 s to 20 s

b)acceleration is zero because the speed is increasing at a constant rate

c)the velocity of T is constant throughout so the acceleration is 0

d) both the cars are coming backw ards

H is ahead of T

but at t=12 T overtakes H

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