A tanker lorry filled up with to $2 / 3$ of water of its height is moving with a uniform speed, when sudden brake is applied, the water in the tank would

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Move backward

Move forward

Be unaffected

Rise upwards

answer is B.

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Detailed Solution

A tanker lorry filled up with to

2 / 3

of water of its height is moving with a uniform speed, when sudden brake is applied, the water in the tank would move forward.
Law of inertia of motion:
“If a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.”
On the sudden application of the brake, the tanker lorry will come to a state of rest but the water remains in the state of motion, so the water will move forward. When the brakes are applied, the vehicle’s velocity decreases, but there is no direct external force operating on the water. As an outcome, the vehicle’s velocity decreases but the velocity of the water within remains unchanged. The water exhibits inertia of motion.

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