1.

When a ball is dropped into a lake from a height 4.9 m above the water level, it hits the water with a velocity v and then sinks to the bottom with the constant velocity v. It reaches the bottom of the lake 4.0 s after it is dropped. The approximate depth of the lake is : (A) 19.6 m (B) 29.4 m (C) 39.2 m (D) 73.5 m

Answer»

Correct option is (B) 29.4 m 

V2 = 2 x 9.8 x 4.9

V = 9.8 m/s

Depth = distance travelled in 3 seconds

= 9.8 x 3 = 29.4 m



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