Question

julieta launches a toy rocket from a platform. the graph below shows the height of the rocket h in feet after t seconds. how many seconds have gone by when the rocket is at its highest point?

Explanation:

Step1: Identify the highest - point on the graph

The highest point on the graph of height $h$ vs time $t$ is the vertex of the parabola - like curve. The coordinates of the highest point are given as $(1,400)$.

Step2: Determine the time value

The $x$ - coordinate of the point on the graph represents time $t$. In the point $(1,400)$, the $x$ - coordinate is $1$.

Answer:

$1$