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Komok [63]
4 years ago
10

Which element is stable and nonreactive?

Physics
1 answer:
const2013 [10]4 years ago
6 0
The answer is D. Krypton (kr)
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You stand 17.5 m from a wall holding a tennis ball. You throw the tennis ball at the wall at an angle of 22.5∘ from the ground w
RUDIKE [14]

The height of the ball would be 4.32 m

<u>Explanation:</u>

Given-

Distance from the ball, s = 17.5 m

Angle of projection, θ = 22.5°

Initial speed, u = 24.5 m/s

Height, h = ?

Let t be the time taken.

Horizontal speed, u_{x} = u cosθ

                                   = 24.5 * cos 22.5°

                                   = 24.5 * 0.924

                                   = 22.64 m/s

Vertical velocity, u_{y} = u sinθ

                                 = 24.5 * sin 22.5°

                                 = 24.5 * 0.383

                                 = 9.38 m/s

We know,

x = u * cos (theta) * t

17.5 = 22.64 * t\\\\t = 0.77s

To calculate the height:

h = ut - \frac{1}{2}gt^2

h =  u sin (theta)t - \frac{1}{2} gt^2

h = 9.38 * 0.77 - \frac{1}{2} * 9.8 * (0.77)^2\\ \\h = 7.22 - 2.90\\\\h = 4.32m\\

Therefore, height of the ball would be 4.32 m

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