Question

A darg racer starts her car from reset and acceleration al 10.0 m/s2 for the entire distance
of 400m How long did it take the race car to travel this distance is s? 1
a) 9.01
b) 8.33
c)10.2
d) 8.94​

Answer 1

Answer: d) 8.94

Explanation:

Answer 2

Answer:

2×(20)^1/2 second

Explanation:

Acceleration of car=10 m/s^2 initial velocity (u)= 0 (car started from rest distance travelled (d)=400 m

From second equation of motion

d=ut+1/2at^2

Since u=0 therefore ut=0

So,d=1/2at^2

400=1/2×10×t^2

400=5×t^2

t^2=80

t=2×(20^1/2) second