David's new motorcycle can accelerate at 5 m/s2. The combined mass of David and his motorcycle is 225.0 kg. What is the size of the net (unbalanced) force that can cause
the acceleration?
020 N
0 200 N
0 980 N
1125 N
0 1350 N
Question 20

current flows in a wire

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.