# Posts by john R

Total # Posts: 2

**math**

Emily has a coupon for 20% off her purchase. She finds a backpack on the discount rack. It's original price is $60 but is 30% off. Emily thinks 30% and 20 % make 50% so the backpack will be $30. Is Emily correct? Explain your answer.

**Physics**

A net force of 1.6×10^−15 N acts on an electron over a displacement of 5.0 cm, in the same direction as the net force. What is the change in kinetic energy of the electron?

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