A stone is dropped from 4.9 m above water level. It entered with veloc

1.	A stone is dropped from 4.9 m above water level. It entered with velocity v and then continue at constant velocity v. It took 4 seconds from throw to reach ground. Find depth of water. (a) 20.4 m (b) 29.4 m (c) 2.94 m(d) 19.4 m
Answer» Correct option is (b) 29.4 m Velocity after falling through a height of 4.9 m v² - u² = 2as v² - 0 = 2(9.8) (4.9) v = 9.8 m/s Time taken to fall by 4.9 m 9.8 = 0 + 9.8t ⇒ t = 1 sec Rest of 3 sec it went inside water with constant speed 9.8 m/s ∴ Depth of water 9.8 x 3 = 29.4 cm

A stone is dropped from 4.9 m above water level. It entered with velocity v and then continue at constant velocity v. It took 4 seconds from throw to reach ground. Find depth of water. (a) 20.4 m (b) 29.4 m (c) 2.94 m(d) 19.4 m

Answer»

Correct option is (b) 29.4 m

Velocity after falling through a height of 4.9 m

v² - u² = 2as

v² - 0 = 2(9.8) (4.9)

v = 9.8 m/s

Time taken to fall by 4.9 m

9.8 = 0 + 9.8t

⇒ t = 1 sec

Rest of 3 sec it went inside water with constant speed 9.8 m/s

∴ Depth of water 9.8 x 3 = 29.4 cm

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A stone is dropped from 4.9 m above water level. It entered with velocity v and then continue at constant velocity v. It took 4 seconds from throw to reach ground. Find depth of water. (a) 20.4 m (b) 29.4 m (c) 2.94 m(d) 19.4 m

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