13. Sketch the velocity-time graphs for the following
motions.
a. a city bus that is moving with a constant
velocity
b. a wheelbarrow that is speeding up at a uni-
form rate of acceleration while moving in the
positive direction
c. a tiger that is speeding up at a uniform rate of
acceleration while moving in the negative
direction
d. an iguana that is slowing down at a uniform
rate of acceleration while moving in the
positive direction
e. a camel that is slowing down at a uniform
rate of acceleration while moving in the
negative direction