A block of mass 2.0 kg is moving to the left and changes its speed from 1.0 m/s to 3.0 m/s. Match the answers with questions. ◆ What is its initial kinetic energy? A. -8.0 J What is its final kinetic energy? B.-4.0 J ◆ What is the change in kinetic energy? C. 1.0 J D. 8.0 J E. 4.0 J F. 9.0 J G. none of the given

A 150 g baseball is thrown straight up.  If it is released at a height of 1.0 m above the ground with a kinetic energy of 2.4 J, what is its height above the ground when its kinetic is 1.2 J?  cc

4. A 70.0 kg student is running at 4.0 m/s. The student jumps and grabs a rope hanging at 3.0 m from the ground without slowing down. Using the principle of energy conservation and neglecting air resistance, how high above the ground will the student swing? (g=10m/s²) a. 3.0m b. 2.7m c. 3.8m d. 4.1m 5. Which of the following is a valid way to measure wavelength? a. Crest to crest b. Node to crest c. Node to node d. Crest to trough 6. A Tesla roadster has a parallel circuit on the inside. The total current is 28 A and it has 2 resistors as shown. What is the voltage of the Tesla roadster? a. 23v b. 34v C. d. 120v 210v R= 20 R=30 1 = 28 A V = ? V

150 kg object is at a height of 12 m. A.) How many joules of kinetic energy does it gain when it falls to the ground?  B.) Using concepts of energy, find the speed of the object in meters per second just before it hits the ground.