4) In which situation is the speed of the car constant while its velocity is changing?
A) The car travels down a straight track at 30
m
Ein
B) The car travels around a circular track at 30
m
Elu
C) The car begins from rest and accelerates to 20 m
20
D) The car begins traveling at 30
ws
and slows to 15
S
En
Since speed has to be constant , we consider only the velocity hence Velocity is associated with directional change , Option B gives a better insight because the car is moving with constant speed but different directions
