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1. A ball falls off a table and reaches the ground in 1 s. Assuming g-10 m/s,calculate its speed on reaching the ground and the height of the table.

Answer»

v = u + gt ( acceleration = acc. due to gravity ) v = 0 + 10 x 1v = 10 m / s the ball will reach the ground at a speed of10 m/s .

acc. to second equation v^2 = u^2 + 2gs100 = 0 + 2 x 10 x s100 /20 = s s = 5 m.



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