Question

a car travelling at 36km per hour upto 72 km per hour in 5 seconds. calculate its acceleration and show that either it is positive or negative acceleration

Answer 1

acceleration=change in velocity(v-u)/time taken
(but first convert the two given velocities in m
72km/hr =72×1000/3600
36km/hr =36×1000/3600)
acceleration=(72×1000/3600)-(36×1000/3600) ×1/5
=360000/5
=72000
So, acceleration is 72000
hope it helps...