Find the change in potential energy of a 2.6kg textbook that falls from the 66-cm height of a table top onto the floor.
Sol’n:
Given: mass of the book = 2.6kg
Height of the fall = 66cm
PE = mgh = (2.6kg)(9.81m/s2)(66cm)(1m/100cm) = 16.81 kg.m2/s2 or Joules
How to solve this
Answer (1)
GivenMass (m) = 2.6 kgHeight (h) = 66 cm = 0.66 mGravitational acceleration (g) = 9.81 m/s*FormulaPE = m • g -hStep 1: Substitute the valuesPE - (2.6)(9.81)(0.66)Step 2: MultiplyPE = 2.6 × 9.81 = 25.50625.506 × 0.66 = 16.83 JFinal AnswerThe change in potential energy is about 16.8 Joules.
