a car travelling with a speed 72 km/h applies brakes if it experiences a constant retardation of 40 m/s^2. calculate the stopping distance.
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First convert the velocity to m/s from km/h. Here, you get it as 20 m/s.
Now, you have final velocity: v = 0 m/s as the body is going to come at rest.
Whole initial velocity: u = 20m/s,
The acceleration is retarding in nature
So, you have a = (-2 m/s²)
Using the Kinematic Equation : v=u+at you get t = 2s
And using v²=u²+2as
You have s=v²/2as = 400/(2)(2),
i.e. s = 100 m
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