A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What is the acceleration of the car?

The acceleration = -40 ms⁻²

Explanation:

Mass m = 1000 kgspeed v₁ = 20 m/sspeed v₂ = 0 m/st = 0.5

We know that,

a = (v₂ -  v₁) / t

  = 0 - 20 / 0.5

  = -20 / 0.5

  = -40 ms⁻²

Thus, the acceleration = -40 ms⁻²

Note: negative sign gives us an idea the car is slowing down after a collision with the barrier, thus acceleration and velocity is in opposite direction.

The answers would be: 1: the liquid only contains one compound4: the liquid is a pure substance

Well the magnitude of its acceleration related to that car starts with the oil change like when you have to change the oil in your car you have to make sure that your precious car is starting really propley and very well