Question

A car is travelling with the velocity of 72 kom h-! If brakes applied
produce uniform retardation of 10 m 52 calculate the time taken by it to stop.​

Answer 1

Answer:

t = 2sec

Explanation:

Retardation (a) = -10m/s²

Velocity (v) = 72km/h => 72×5/18 => 20m/s

Initial velocity (u) = 0

Time (t) = ?

We know ,

★ v = u + at ★

➞ 20 = 0 + -10 × t

➞ 20 = -10t

➞ t = 20/10

➞ t = 2sec