Question

4- Find the required time for a car to move 98 m if it starts from rest and acceleration at 40 m/s2?

Answer 1

t = 2.21 s

Explanation: s = 98 m

u = 0 m/s

a = 40 m /s ^2

Using the second equation of motion :

s = ut + 1/2 at ^2

98 = 0 × t + 1/2 × 40 × t × t

98 = 0 + 20 t ^2

98 = 20 t ^2

98 / 20 = t ^2

4.9 = t ^2

t = √ 4.9

t = 2.21 s