A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is

A stone weighing 3 kg falls from the top of a tower 100 m high and bur

1.	A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is
A.	0.09 sec
B.	0.9 sec
C.	2.1 sec
D.	1.3 sec
Answer» B. 0.9 sec

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A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is

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