Question

QUESTION 28 A 3.75 kg ball is thrown directly at a wall at a speed of 3.0 m/s. It bounces off of the wall and returns at 2.50 m/s. What is the change in energy of this ball over the course of the collision? O 1.9) 20.6) 5.2) 28.6) QUESTION 29 A 3.75 kg ball is thrown directly at a wall at a speed of 3.0 m/s. It bounces off of the wall and returns at 2.50 m/s. What is the change in momentum of this ball over the course of the collision? 5.2 kg m/s 20.6 kg m/s 28.6 kg m/s O 1.9 kg m/s

Answer 1

828 o Given mass of Ball m= 3.75 kg d Partial speed of ball Vi= 3 m/sec final speed of Bal Up = 2.5 m/sec the ball is through to the wall at bounces off cofth some height h. height h and let : It - wall Plea-------- ground frat Partial - The change in total energy AE = Ep - Ep. to = KE + P E = 1 mg + might Ep = fmittel enlagy > KEP+ PET = m0pRingh KE= kinetic energy P. E = Potential energy and g=10 m/sec² AE = 1 m Vp tigh - I love ingh - 1 m ( 1, 2) AE = 3 X3.75 ( 3*-(2,5733 = 3.75 (9– 6.25) = 5.156J I The Change in energy is nearly 5.25