A rock is thrown off a cliff with a speed of 5 m/s downward. How far will it fall after 7 seconds have elapsed?

Distance traveled is the average velocity times time.  When something is dropped (or thrown), it accelerates downward in accord with the acceleration of gravity ( g = 9.8m/sec2)

The increase in velocity while falling is simply t * 9.8,  t = 2, so the increase is 19.6 m/s.  The initial velocity is 3, so the final is 22.6, and the average is 25.6/2 = 12.8m/s

Therefore, d = v(average) * t = 12.8 * 2 = 25.6m

The equivalent formula is:

d = v(initial)*t + (a*t2) / 2

d = 3*2 + 4.9 * 4 = 25.6

Explanation:

Distance traveled is the average velocity times time.  When something is dropped (or thrown), it accelerates downward in accord with the acceleration of gravity ( g = 9.8m/sec2)

The increase in velocity while falling is simply t * 9.8,  t = 2, so the increase is 19.6 m/s.  The initial velocity is 3, so the final is 22.6, and the average is 25.6/2 = 12.8m/s

Therefore, d = v(average) * t = 12.8 * 2 = 25.6m

The equivalent formula is:

d = v(initial)*t + (a*t2) / 2

d = 3*2 + 4.9 * 4 = 25.6

the journeys of marquette, joliet and la salle a) new france expand.

all three of these explorers explored the midwest and the area around the great lakes, which they subsequently claimed for france.

this was a big portion of territory and expanded new france which before then only consisted of quebec province in northeastern canada