Question

25. A ball is projected vertically upward from the ground. If ball is at height h at t = 4 s and 5 s, then value of his
(1) 101.25 m (2) 100 m (3) 105 m (4) 95 m​

Answer 1

Answer:

(b) is correct answer of the question

Explanation:

it took 1 second to reach from A to B.

Due to symmetry it will take 0.5 second to reach from A to C.

Hence total time to reach from ground to C = 4+0.5=

2

9

sec

Maximum height =

2

1

×g×(

2

9

)

2

=101.25m

Length covered from C to B =0+

2

1

×g×(

2

1

)

2

=1.25m

∴ h = Maximum height - CB

=101.25−1.25=100m

Answer 2

Answer:

(3) 105 m

Explanation:

A ball is projected vertically upward from the ground. If ball is at height h at t = 4 s and 5 s, then value of his