State Newton's universal law of gravitation. A stone is dropped from the top a 40 m high tower. Calculate it's speed after 2s, also find the speed with which the stone strikes the ground .(Take g = 10m/s^2)?
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Universal law of gravitation states that every place in earth shall have gravity a force by which everything is pulled downwards.
speed= Distance /time = 40/2 secs = 20 ms-¹
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