Question

15.)A stone is dropped from a plane flying at a height of 10000 m above the ground.
As the stone falls d, its distance above the ground after t seconds is given by the
formula
d = - 16t + 10000
How far above the ground is the stone, when it has fallen for 20 seconds ?
(B)
9680 m​

Answer 1

Answer:

44.1=H-(distance travled in (

g

2H

−1s)

Time of flight =

g

2H

Distance traveled in (

g

2H

)−1=

2

1

g

(

g

2H

−1)

2

=

2

g

(

g

2H

+1−2

g

2H

)

=H+

2

g

−

2gH

44.1=

2gH

−

2

g

=

2gH

−4.9

2gH

=49

2×9.8×H=49×49

H=

9.8×2

49×49×10

H=

4

490

=122.5m