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1. From rest, a car accelerated at 8 m/s2 for 10 seconds.
a) What is the position of the car at the end of the 10 seconds?
b) What is the velocity of the car at the end of the 10 seconds?​

Sagot :

a) The car starts from rest therefore the initial speed u = 0. Nothing is said about the initial position and we therefore assume it is equal to 0. Hence the position x is given by the equation

x = (1/2) a t 2

where a is the acceleration (=8 m/s2) and t is the period of time between initial and final positions

x = (1/2)8 (10)2 = 400 m

b) The velocity v of the car at the end of the 10 seconds is given by

v = a t = 8 * 10 = 80 m/s