5. Velocity-time graph of a block of mass 100 g sliding on a horizontal concrete floor under the action of a constant force of 5 N is shown below. The magnitude of frictional force acting on the block due to the floor is Velocity(m/s) 80 60 40 20 ? 2 4 6 8 Time (s) (1) 4 N (2) 5 N (3) 3 N (4) Zero iling point of a liquid X is 20°C more than th
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