What is the initial speed of the car, if in 20 seconds it covers 400 m, moving with an acceleration of 1.2 m / s2.

The distance traveled by the car can be calculated using the formula:
S = V0 * t + a * t² / 2, where S is the distance covered by the car (S = 400 m), V0 is the initial speed of the car (m / s), and is the acceleration (a = 1.2 m / s²), t – movement time (t = 20 s).
Let us express and calculate the initial speed of the vehicle:
S = V0 * t + a * t² / 2.
V0 * t = S – a * t² / 2.
V0 = (S – a * t² / 2) / t = (400 – 1.2 * 20² / 2) / 20 = 160/20 = 8 m / s.
Answer: The initial speed of the car is 8 m / s.