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Question

A 4kg block is pushed with 20N over 6m on a frictionless surface, starting from rest. What is its final speed?

Options

Choose one · Correct answer highlighted

Explanation

Work W=20×6=120J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 7 m/s. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.