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 and then sinks to the bottom with the constant velocity . It reaches the bottom of the lake 4.0 s after it is dropped. The approximate depth of the lake is :
← JEE Main 2022 · 27 Jun · Shift 2
PhysicsSingle correct+4 / -1Question 33 of 90
JEE Main 2022 · 27 Jun · Shift 2, Physics question 33
Answer and worked solution
Official answer: B
Fall. 4.9 m takes 1 s and gives m s.
In water. The remaining 3 s at 9.8 m s: depth m.
(B)
Topics:Motion in a straight line