A water tanker filled up to two-thirds of its tank with water is running with a uniform speed. When the brakes are suddenly applied, the water in its tank would :

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

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Solution

(b) move forward
This is because of the inertia of the water in the tank that makes it remain in its state of motion even though the water tanker has stopped moving.

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