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Hrishant Goswami Grade: 10
         An NCC parade is going at a uniform speed of 6 km/h through a place under a berry tree on which a bird is sitting at a height of 12.1 m. At a particular instant the bird drops a berry. Which cadet (give the distance from the tree at the instant) will receive the berry on his uniform?
3 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
										Sol. Let the true of fall be ‘t’ initial velocity u = 0

Acceleration a = 9.8 m/s2
Distance S = 12/1 m
∴ S = ut + ½ at2
⇒ 12.1 = 0 + 1/2 (9.8) × t2
⇒ t2 = 12.1/4.9 = 2.46 ⇒ t = 1.57 sec
For cadet velocity = 6 km/hr = 1.66 m/sec
Distance = vt = 1.57 × 1.66 = 2.6 m.
The cadet, 2.6 m away from tree will receive the berry on his uniform.
3 years ago
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