Question

1.
A ball is dropped from a height and falls due to
gravity and wind simultaneously imparts it a
uniform horizontal acceleration. Which one of
the following figures best represents its path?



​

Answer 1

Answer:

The time taken by the ball to reach the ground is 3.16 s.

D

The angler made by the line joining initial and final position (on the ground 1st strike) of the ball with horizontal is greater than 45

o

.

u

x

=u

y

=0,a

x

=4.9 ms

−2

,a

y

=9.8 ms

−2

So x=

2

1

a

x

t

2

, and y=

2

1

a

y

t

2

y

x

=

a

y

a

x

=

2

1

So path of the ball is a straight line.

Let t be the time taken by the ball to reach ground,

then 49=

2

1

a

y

t

2

⇒t

2

=10⇒t=3.16 s

tanθ=

a

x

a

y

=2⇒θ=tan

−1

(2)