What is the acceleration of an object if it goes from a velocity of +25 m/s to rest in 5.0 seconds?
A.
–25 m/s2
B.
–5 m/s2
C.
+5 m/s2
D.
+25 m/s2
(1 pt)
Taking the direction west to be positive, and east to be negative, what is the average acceleration of a jet ski that goes from rest to 10 m/s west in 4 seconds?
A.
2.5 m/s2
B.
0.4 m/s2
C.
–0.4 m/s2
D.
–2.5 m/s2
Which moving body has no acceleration?
A.
a satellite orbiting at a constant speed
B.
a person running once around a track at a constant speed
C.
a car making a turn at a constant speed
D.
a person running 100 m straight across a field at a constant speed
