Question

The rocket car was already going 190 mph when the timer started his watch.How fast, in mph, was the rocket car going seven minutes later if it increased its speed by 15 miles per hour every minute?A 205B. 295C. 900D. 1330E. 2850

Answer 1

Let's begin by listing out the information given to us:

speed (s) = 190 mph

The timer started his watch afterwards & measured 7 minutes

time (t) = 7 minutes = 7 mins

If the car increased its speed by 15 mph every minute:

acceleration (a) = 15mph/min, we have:

speed (after 7 minutes) = speed + acceleration * time

$\begin{gathered} x(7min)=s+at \\ x(7min)=190+15\cdot7 \\ x(7min)=295mph \end{gathered}$