The answer depends on whether the ball is thrown vertically upwards or downwards. That critical piece of information is not provided!
Acceleration is a change in speed, measured per second and so would be meters per second per second or meters per second squared.
Feet per second x 0.3048 = meters per second.
Multiply by time
15 mph = 6.7 meters per second.
55 mph = 24.59 meters per second.
9.8 meters per second
17.8 meters
Burj Khalifa in Dubai, UAE is the highest building in the world at 828 meters. The Makkah Royal Clock Tower Hotel in Mecca, Saudi Arabia is now the second largest building in the world at 601 meters. A difference of 227 meters.
He will not make it.
Acceleration of gravity = 9.8 m/sec2.39.2 / 9.8 = 4 seconds
Assuming that the gun is fired parallel to the ground, the bullet will begin to fall the instant that it leaves the muzzle. The total fall will be 200 meters. You will need to calculate how long it will take an object to fall 200 meters (hint- about 9.753 meters per second per second- or 9.753 meters the first second, 19.50 meters during the second second, etc) THEN multiply the velocity of the bullet (643 meters/ second) by the number of seconds it is in flight. That will be the distance when it hits the ground.
42
Ignoring any effects due to air resistance, the speed of the stone is zero at the instant it's dropped, and increases steadily to 78.98 meters per second when it hits the ground. The velocity is directed downward throughout the experiment.
I assume you hit it up from the ground level as well. From Conservation of Energy, it immediately follows that: * If there is no air resistance, when it hits the ground it will, once again, have a speed of 100 meters per second. * Since under usual circumstances there WILL BE air resistance, its speed will be less than 100 meters per second.
They should reach the ground together, since their initial vertical speed is the same, namely zero.
A projectile fired directly upwards has no positive velocity. Its only velocity is attributed to the force of gravity, which is -9.8 meters per second squared.
20 meters per second