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A car of mass 480 kg moving at a speed of 54 km/h is stopped by applying breaks after moving a distance 75 m. Calculate the force applied by the breaks. Also find the time taken for the body to stop |
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Answer» Given :- Mass of a car, m = 480 kg Initial velocity of the car, u = 54 km/h = 5/18 × 54 = 15m/s Final velocity = 0 m/s Time = 10 seconds To Find :- Force applied by the brakes Formula to be USED :- 1. ACCELERATION = Final velocity - Initial velocity/Time 2. Force = mass × acceleration Solution :- Putting all the values, we get ⇒ Acceleration = v - u/t ⇒ Acceleration = (0-15)/10 ⇒ Acceleration = 15/10 ⇒ Acceleration = 1.5 m/s² We have to find Force, So putting Acceleration VALUE on 2nd formula. ⇒ Force = mass × acceleration ⇒ Force = (480 × 1.5) Newton ⇒ Force = 720 Newton. Hence, the force applied by the brakes is 720 Newton.Explanation: |
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