The rate at which an object's velocity changes with time is called its
a. instantaneous velocity.
b. motion.
c. speed.
d. acceleration.
d
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Conservation of Momentum: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?
A. 0.50 m/s B. 0.28 m/s C. 0.38 m/s D. 0.75 m/s E. 0.00 m/s
An electric generator is a device that converts electrical energy into mechanical energy
Indicate whether the statement is true or false
Gamma radiation is used to kill harmful bacteria in food
Indicate whether the statement is true or false
A rocket is launched from the origin with an acceleration of 20.0 
at an angle of 30.0 degrees above the horizontal. The launch acceleration lasts for 2.00 seconds at which time the fuel is exhausted. The rocket then falls with an acceleration of 9.80 
downward. What is the maximum height?
A. 22.3 m B. 27.5 m C. 30.5 m D. 36.7 m E. 20.0 m