A particle falls freely under gravity

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A particle falls freely under gravity. In the first tt seconds it covers distance x1x_1 and in the next tt seconds it covers distance x2x_2. Then tt is: (1) x2−x1g\sqrt{\frac{x_2-x_1}{g}} (2) x2+x1g\sqrt{\frac{x_2+x_1}{g}} (3) 2(x2−x1)g\sqrt{\frac{2(x_2-x_1)}{g}} (4) 2(x2+x1)g\sqrt{\frac{2(x_2+x_1)}{g}}

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