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1.  An object of mass \(2\ kg\) is sliding with a constant velocity of \(4\ m\ s^{-1}\) on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
 
 
2. A water tanker filled up to \(\frac{2}{3}\) of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would