When a car moves forward at a speed of 10m / s and the acceleration is 2.5m/s2 after braking, what is the displacement in 3S? What is the displacement within 10 seconds after braking?

When a car moves forward at a speed of 10m / s and the acceleration is 2.5m/s2 after braking, what is the displacement in 3S? What is the displacement within 10 seconds after braking?

The time for the vehicle speed to reduce to zero is: t0 = 0-v0a = - 10-2.5 = 4S, so the displacement within 3s of the vehicle is: x = v0t-12at2 = 10 × 3-12 × 2.5 × 32 = 18.75m; the displacement within 10s of the vehicle is the displacement within 4S after braking: X ′ = 10 × 4-12 × 2.5 × 42 = 20m A: the displacement within 3S is 18.75m; the displacement within 10s after braking is 20m