A water rocket is projected vertically upward from the ground. Its height (h) m above ground after t seconds is given by h= 20-5(t-2)². When will the rocket reach the ground?

t=4 seconds

Step-by-step explanation:

The height of the water jacket that is projected vertically upward is given by the equation:

We want to find the time that, the rocket reaches the ground.

When the rocket reaches the ground, the height , h becomes 0.

This implies that:

Subtract 20 from both sides:

Divide through by -5;

Take square root:

l

Therefore the feasible time is after 4 seconds.

11

step-by-step explanation:

32.50-7.50=25

225/25=11