A car is traveling north at 20.0 m/s at time t = 0.00 s. The same car is traveling north at 24.0 m/s at time t = 8.00 s. What statement is necessarily true about the acceleration of the car?
A)
The car undergoes constant acceleration of 0.500 m/s2 during the time from t = 0.00 s to t = 8.0 s.
B)
The car undergoes constant acceleration of 4.00 m/s2 during the time from t = 0.00 s to t = 8.0 s
C)
The car has zero acceleration during the time from t = 0.00 s to t = 8.0 s
D)
The average acceleration of the car is 0.500 m/s2 during the time from t = 0.00 s to t = 8.0 s
E)
The average acceleration of the car is 4.00 m/s2 during the time from t = 0.00 s to t = 8.0 s
Question 2
Neglecting air resistance, when you toss a stone straight up in the air from Earth's surface, which of the following statements is true for the upward motion of the stone.
A)
The stone's total energy increases.
B)
The stone's kinetic and gravitational potential energies increase simultaneously.
C)
The stone's kinetic and gravitational potential energies decrease simultaneously.
D)
The stone's kinetic energy decreases while its gravitational potential energy increases.
E)
The stone's kinetic energy increases while its gravitational potential energy decreases.
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