Question

Which of the following is example of positive acceleration
 a. At t = 5 sec the velocity of a car is 40 km/h and at t =10 sec the velocity of the car is 48 km/h
b. At t = 5 sec the velocity of a car is 40 km/h and at t =10 sec the velocity of the car is 38 km/h . c.
At t = 5 sec the velocity of a car is 40 km/h and at t =10 sec the velocity of the car is 40 km/h
d. None of above​

Answer 1

Calculating acceleration involves dividing velocity by time — or in terms of SI units, dividing the meter per second [m/s] by the second [s]. Dividing distance by time twice is the same as dividing distance by the square of time. Thus the SI unit of acceleration is the meter per second squared .

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Your answer is (b)

Answer 2

Answer:

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