A water tanker filled up to 2/3 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

Answer: (b) move forward

On applying brakes water tanker comes to rest but water will be in motion this makes the water to come forward.

When a tanker is filled to 2/3 capacity of water, the water inside the tanker moves at the same velocity as the tanker. As a result, it remains constant. When the tanker’s brakes are applied, the tanker’s velocity decreases, but no external force is operating directly on the water. As a result, the tanker’s velocity reduces but the velocity of the water within stays unchanged.

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