4. A softball traveling at 34 m/s has a kinetic energy of 98 J. Calculate its mass. 5. A 1.0 kg ball is dropped from the top of a cliff and falls with a constant acceleration due to gravity (9.8 m/s). Assume that effects of air resistance can be ignored. a) By how much has the ball's gravitational potential energy change after it has fallen by 10m? bj How fast is the ball going after it has fallen by 10 m?

036. A 1.50 kg model train initially traveling at 0.50 m/s acceler- ates to 1.00 m/s in 10. s. a. What is the change in the train's kinetic energy? b. How much power was expended to accelerate the train?

2. An object has 560 J of potential energy and 890 J of mechanical energy. How much kinetic energy does the object have?. ME = REHPE 560 560 330J= PE olog ertev 3. A slingshot rubber band with a spring constant of 850 N/m was stretched 0.33 m. A 0.4 kg rock was fired from the slingshot after it was released. a. Find the spring potential energy. PE =)2 kx? Z(850X.33) b. What is the kinetic energy of the stone once it was released? PEERE c. What is the velocity of the stone as soon as the slingshot was released?

A. Ignoring air drag, what is the takeoff speed of such a flea? (in m/s) B. Calculate the kinetic energy of this flea at takeoff (in J) C. Calculate the kinetic energy per kilogram of mass (in J/kg) D. If a 73.0 kg, 1.80 m tall human could jump to the same height compared with his length as the flea jumps compared with its length, how high could the human jump? (in m) E. If a 73.0 kg, 1.80 m tall human could jump to the same height compared with his length as the flea jumps compared with its length, what takeoff speed would the man need? (in m/s) F. Most humans can jump no more than 60.0 cm from a crouched start. What is the kinetic energy per kilogram of mass at takeoff for such a 73.0 kg person? (in J/kg)

ma (m=56.2 kg) is traveling at a speed of 12.8 m/s at the top of a 19.5-m highroller coaster loop.a. Determine Ima's kinetic energy at the top of the loop.b. Determine Ima's potential energy at the top of the loop.c. Assuming negligible losses of energy due to friction and air resistance,determine Ima's total mechanical energy at the bottom of the loop (h=0m).d. Determine Ima's speed at the bottom of the loop.*only answer d