Question

a car moving with a certain velocity comes to a halt if the retardation was 5m/s square, find the initial velocity of the car

Answer 1

Given that,

The retardation of the car is 5 m/s².

To find,

The initial velocity of the car.

Solution,

Whenever an object comes to halt, it mean that its final velocity is equal to 0. Let t is the time. We can find the initial velocity of the car using equation of kinematics as follows :

v = u + at

v = 0

u=-at

Putting values, we get :

$u=-(-5)t\\\\u=5t\ m/s$

Hence, the initial velocity of the car is 5t m/s.

Answer 2

Answer: The initial velocity of the car is 5 m/s.

Explanation:

Given that, The retardation of the car is 5 m/s².

So the initial velocity of the car.

Whenever an object comes to halt, it means that its final velocity is equal to 0.

Let t's the time. We can find the initial velocity of the car using the equation of kinematics as follows :

u = initial velocity = ? m/s

v = final velocity = 0 m/s

a = acceleration = -1 m/s²

t = time interval = 5 s

Use the following kinematic equation.

v = u + at

Solve for u.

u = v - at

u = 0 m/s - (-1 m/s² × 5 s)

u = 5 m/s

Hence, the initial velocity of the car is 5 m/s.

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