Answer:
Speed: Increasing
Acceleration: Not zero
Option D is correct
Explanation:
As seen from the table, as the time interval increases, the speed of the car increases.
Acceleration is the change in speed per unit change in time.
Speed at 0 s is 0 km/hr ( 0 m/s)
Speed at 5 s is 30 km/hr = 30 x 1000/3600 m/s = 8.33 m/s
Speed at 10 s is 50 km /hr = 50 x 1000/3600 m/s = 13.89 m/s
Speed at 15 s is 60 km /hr - 60 x 1000/3600 m/s = 16.67 m/s
Between 0 to 5 s, the acceleration is:
a = (8.33 - 0)/(5-0)
a = 1.67 m/s^2
Between 5s and 10 s, the acceleration is:
a = (13.89 - 8.33)/(10 - 5)
a = 1.11 m/s^2
As seen from the calculation above, the acceleration of the car is decreasing but not zero.
Speed: Increasing
Acceleration: Not zero
