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Rahul yadav

· started a discussion

· 1 Months ago

Ans. is 6 km/h (Question: 398353.0 )

height is constant 50*root 3

30 degree means = 150 m and 60 degree means 50 m

200m in 2 minutes
200/120=5/3m/s= 5/3*18/5= 6 km/h

Question:

A boy standing in the middle of a field, observes a flying bird in the north at an angle of elevation of 30º and after 2 minutes, he observes the same bird in the south at an angle of elevation 60º. If the bird flies all along in a straight line at a height of  503    m. then the speed of bird in km/h.   –

Options:
A)

4.5

B)

3

C)

9

D)

6

Solution:

Ans: (b)


Hari singh

· commented

· 1 Months ago

Yet to be approved!
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