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:

We know that,

a = (v₂ -  v₁) / t

  = 0 - 20 / 0.5

  = -20 / 0.5

  = -40 ms⁻²

Thus, the acceleration = -40 ms⁻²

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles