1.

A stone is shot straight upward with a speed of 20m/sec from a tower 25 m high. The speed with which it strikes the ground is approximately. ​

Answer»

v^2 = u^2 +2as 0 = (20)^2 + 2(-10)S S = 20 TOTAL DISTANCE REQUIRED TO TRAVEL TO HIT THE GROUND =25 + 20 = 45 v^2 = u^2 +2as v^2 = 0 + 2 × 10 × 45v^2 = 900v = 30 m/s



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