Can someone explain please?

Hi there!

We can begin by solving for the velocity in which the ball was thrown at using the following:

At the top of the trajectory, the ball's velocity is equal to 0 m/s, so:

'a' = acceleration due to gravity and 'd' is the max height, so:

Now, we can use the same equation to calculate the final speed at 4.5 m. Remember, the acceleration is NEGATIVE in this instance (taking the negative direction to be in the direction of gravity).

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j