Question

due to application of brakes which produce a uniform deceleration of 4m/s square a car comes to rest in 50m the initial speed of the car is​

Answer 1

Answer:

20m/s

Explanation:

Use formulq v^2 +u^2 =2as

Answer 2

Answer:

20 m/s

Explanation:

We use the formula v2 = u2 + 2as

a = -4, s = 50m, v = 0, u = ?

Now we apply formula v2 = u2 + 2as

0 = u2 + 2(-4)(50)

0 = u2 - 400

u2 = 400

u = 20