A water tanker filled up to 2/3 of its height
Question:

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.

Solution:

(b) Explanation: It is due to inertia of motion.