21: Define Real and pseudo force.<br />A car of mass 1.5 ton is running at 72kmph on a straight horizontal road on turning of<br />engine off, it stops in 20 seconds while running at the same speed on the same road,<br />the driver observes an accident 50 m in front of him. He immediately applies the brakes<br />and just manages to stop the car at the accident spot calculate the braking force.
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