Answered

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Please see image attached.1. Is the speed increasing or decreasing?2. Is the car accelerating or decelerating?

Please See Image Attached1 Is The Speed Increasing Or Decreasing2 Is The Car Accelerating Or Decelerating class=

Sagot :

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

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