Question

the fastest airplane is the lockheed sr 71 blackbird a high altitude spy plane first built in 1964. if an sr-71 is clocked traveling 15.0 km west in 15.3 s, what is its average velocity in kilometers per hours

Answer 1

For the motion of the plane it is given to us that it travel 15.0 km in 15.3 s

So here we can use the formula of average velocity to find it

formula is given as ratio of total displacement and total time

$v = \frac{displacement}{time}$

here it is given that

$displacement = 15.0 km$

time = 15.3 s

we need to convert the time into hour as the speed is required in km/h

so we know that

$1 h = 3600 s$

$t = 15.3 s * \frac{1h}{3600 s}$

$t = 4.25 * 10^{-3} h$

now by the above formula

$v = \frac{15.0}{4.25 * 10^{-3}}$

$v = 3529.4 km/h$

so the velocity of the plane would be 3529.4 km/h