Step-by-step explanation:
Given,
A car is starting from rest, so it's initial velocity (u)= 0m/s
Acceleration (a) = 20m/s²
distance covered (s) = 50m
Therefore, time taken (t) = ?
Here,
s= ut + 1/2 at²
or, 50 = 0 × t + 1/2 × 20 × t²
or, 50 = 0 + 20t² /2
or, 50× 2= 20t²
or, 100 = 20t²
or, 100/20 = t²
or, 5 = t²
or, √5 = t
therefore, t = 2.2360 seconds.