Hesch said:Suggesting there is no air resistance ( no loss of energy ):
½*m*V02 = m*g*H →
V02 = 2*g*H
or you could say:
V02 – Vf2 = 2*g*H ( Vf = 0 ).
Hesch said:And you should use g = +9.8.
Otherwise the potential energy will be negative.
Hesch said:No, your first line is correct, but the second is not.
V02 is not equal to 0.
Hesch said:Yes.
Remember units!
Thank you for all your help :) it is greatly appreciatedHesch said:V02 = 2 × 9.8 [m/s2] × 8 [m] = 156.8 [m2/s2] →
V0 = √(156.8 [m2/s2]) = 12.52 [m/s]
Always check the units. Then you can see if something is wrong in your calculation.
Here the square root was missing.
The formula for calculating the speed needed to reach 8m is v = √(2gh), where v is the speed in meters per second, g is the acceleration due to gravity (9.8 m/s²), and h is the height in meters.
The factors that affect the speed needed to reach 8m include the height from which the ball is thrown, the acceleration due to gravity, and any air resistance or other external forces acting on the ball.
The minimum speed required to reach 8m is approximately 8.86 m/s, assuming the ball is thrown from ground level and there is no air resistance or other external forces acting on the ball.
The maximum speed that a ball can be thrown to reach 8m is infinite, as long as the height from which it is thrown is also infinite. However, in a real-world scenario, factors such as air resistance and the physical limitations of the thrower will limit the maximum possible speed.
Calculating the speed needed to reach 8m can be useful in a variety of sports and activities, such as throwing a javelin or discus, hitting a golf ball, or performing a long jump. It can also be applied in engineering and physics, for example in designing roller coasters or calculating the trajectory of a projectile.