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Question 8
A water tanker filled up to 23 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would

(a) move backward
(b) move forward
(c) be unaffected
(d) rise upwards

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Solution

By Newton's first law of motion, the body which stays in motion will continue to stay in motion if no external force is applied to it. Since the water in the tanker is not the part of the tanker, hence when we apply brakes on the tanker, the water does not stop as there is no external force on it. So, the water in the tanker will move forward.Hence option B is correct.

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