The car starts moving and develops a speed of 36 km / h in 10 seconds.
| July 26, 2021 | education
The car starts moving and develops a speed of 36 km / h in 10 seconds. How long does it take for the car to travel 4.5 m after the start of the movement?
Data: t (movement time) = 10 s; V (the speed that the car will develop in 10 seconds) = 36 km / h; S (the path that the car must travel after starting to move) = 4.5 m.
SI: V = 36 km / h = 10 m / s.
1) Determine the constant acceleration with which the car was moving: V = a * t, whence a = V / t = 10/10 = 1 m / s2.
2) The time of movement of the car when passing 4.5 m: S = a * t ^ 2/2, whence t = √ (2S / a) = √ (2 * 4.5 / 1) = 3 s.
Answer: The car will cover 4.5 meters in 3 seconds after starting to move.
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