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The most accurate statement is B.
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Answer:
After 9 seconds the object reaches ground.
Step-by-step explanation:
We equation of motion given as h = -16t²+128t+144,
We need to find in how many seconds will the object hit the ground,
That is we need to find time when h = 0
0 = -16t²+128t+144
16t²-128t-144= 0
Negative time is not possible, hence after 9 seconds the object reaches ground.
Answer:
Could it be Bond together?
Explanation:
Usually the word bond means join I may be wrong sorry x
<span>A: 9.4248 m
B: 2.773 s
A ball tossed in to the air at 13.6m/s will experience a constant acceleration due to gravity of 9.81m/s^2. It will reach a 0 velocity at
13.6m/s^2 / 9.81m/s^2 = 1.386 s
from the time it was thrown. It will fall to the ground another 1.386 seconds giving a total time in the air of
2*13.6m/s^2 / 9.81m/s^2 = 2.773 s
To calculate the maximum height of the ball we use the fact that acceleration is constant. Between being thrown and reaching the maximum height the velocity constantly accelerates from 13.6m/s to 0 which gives an average velocity of 13.6m/s / 2 = 6.8m/s
Now that we know average velocity and the time, the distance can be calculated.
1.386s * 6.8m/s = 9.4248m</span>