Question

2

The height in meters of a projectile involves the object's initial height,
upward velocity, and acceleration because of gravity. If the equation
y =- 9.8t + 109.7t + 7.4 models the number of meters, y, a toy rocket
is above the ground t seconds after being launched, what does the 7.4
represent?

Answer 1

Answer: Initial height before launch

Explanation:

Given

The equation
`y=-9.8t+109.7t+7.4` the height of toy rocket after t sec

when the rocket is launched, time is
`t=0`

Substituting 0 for
`t` in the equation

`\Rightarrow y(0)=-9.8(0)+109.7(0)+7.4\\\Rightarrow y(0)=7.4`

Here,
`7.4` represents that rocket is already at a height of
`7.4` m before the launch.