As a 10 kilogram mass on the end of a spring passes through its equilibrium position, the kinetic energy of the mass is 20 joules. The speed of the mass is:
a) 2.0 meters per second
b) 4.0 meters per second
c) 5.0 meters per second
d) 6.3 meters per second
Ans:
2.0 meters per second is the speed of the mass.