A car of 900 kg mass is moving at the velocity of 60 km/hr. It is brought into rest at 50 meter distance by applying a brake. Now, calculate the force required to stop the car.

Explanation:

where;

= final velocity = 0

= initial velocity = 60 km/h = 16.67 m/s

= acceleration

= distance

First all of, because acceleration is given in m/s and not km/h, you need to convert 60km/h to m/s. Our conversion factors here are 1km = 1000m and 1h = 3600s

Solve for a;

Begin by subtracting

Divide by 2d

Now plug in your values:

If you're wondering why I calculated acceleration first is because in order to find force, we need 2 things: mass and acceleration.

m = mass = 900kg

a = acceleration = -2.78m/s

It's negative because the force has to be applied in the opposite direction that the car is moving.

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