Answer:
<em>1.0625 seconds</em>
Step-by-step explanation:
Given that:
Initial velocity of Belinda, 
Height in feet of Belinda above the trampoline is given as the formula:

Where
is the time in seconds.
To find:
Time taken by Belinda to come back to trampoline = ?
Solution:
When Belinda will come back to trampoline, the height will be zero.
Putting 
We have the equation as:

Therefore, the answer is: <em>1.0625 seconds</em>