Answer:
Explanation:
initial velocity, u = 0 m/s
final velocity, v = 30 m/s
Let the mass is m .
Initial kinetic energy, Ki = 1/2 mu² = 0
Final kinetic energy, Kf = 1/2 mv² = 0.5 m x 30 x 30 = 450 m
Specific energy change = change in kinetic energy per unit mass
= 450 m / m = 450 J/kg = 0.45 kJ/kg
Provided the projectile is landing at the same elevation as it is launched from, it is 45 degrees
this is true. I can confirm, just got it right on edge
The ball will be 49.5m from the base when it hits the ground based on 9.8m/s² earth gravity.
what is earth gravity?
Gravity is the force by which a planet or other body draws objects toward its center. The force of gravity keeps all of the planets in orbit around the sun.
Why do things fall down when you throw them or drop them? The answer is because gravity ; an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall.
First, let's try to find the time taken by ball to reach the ground :

t = 
t = 
t = 9.9 s (rounded)
Next, we will find the horizontal distance covered by ball :
D = v*t
D = 5 * 9.9
D = 49.5m
Therefore, the ball will be 49.5m from the base when it hits the ground for the first time based on 9.8m/s² earth gravity.
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