man is approaching a hill with a velocity of 5 m/s. He fires a gun when he is 3 km away from the hill. (i) When and (ii) where will he listen the echo?
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He will listen the echo at the sum of (3×5)kilometres.
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A motorcar is moving with a velocity of 108 km/h and it takes 5 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 2000 kg.
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