For what period of time did the car move from a state of rest with acceleration, the modulus

For what period of time did the car move from a state of rest with acceleration, the modulus of which a = 3.0 m / s, gained speed, the modulus of which is v = 15 m / s?

Initial data: a (module of acceleration with which the car started to move) = 3 m / s ^ 2; V (module of the speed that the car gained after acceleration) = 15 m / s; V0 (initial speed, vehicle movement started from rest) = 0 m / s.

The time interval during which the car reached the given speed is determined from the formula: V = V0 + a * t = a * t, whence t = V / a.

Let’s make a calculation: t = 15/3 = 5 s.

Answer: The car will pick up the set speed in 5 seconds.