If 11,550 J heat is absorbed by a copper object when it is heated from 20.0°C to 30.0°C, what is the mass of the copper?
The specific heat of copper is 385 J/kgK.
A 3.00 kg
B 2.87 kg
C 3.7 kg
D 1.5 kg

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

well clustered together.

points close on a scatter diagram