PLEASE HELP NEED EXPLANATION TOO Banpo Bridge fountain is 60 metres above the water. The water is projected with a horizontal speed of 6m/s -Calculate: a. The time taken to hit the river for a single droplet of water. b. The range of the projectile for a single droplet of water. c. The velocity (diagonal) when it hits the water.

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.