1) A car decelerates from a speed of 30 m / s to a speed of 10 m / s over a distance of 400 m

1) A car decelerates from a speed of 30 m / s to a speed of 10 m / s over a distance of 400 m.

a) How long does this process take, assuming constant acceleration?

b) What is the value of the acceleration?

2)A fighter jet lands on the platform of an aircraft carrier. It touches the platform with a speed of 70 m / s and comes to a complete stop at a distance of 200 m. If this process has

place with constant deceleration, what is the speed of the jet 40 m before the final location where it stops completely?