An Ideal Spring Is Used to Fire a 15

Multiple Choice

An ideal spring is used to fire a 15.0-g block horizontally.The spring has a spring constant of 20 N/m and is initially compressed by 7.0 cm.The kinetic energy of the block as it leaves the spring is:

A) 0 J
B) 2.5 * 10^-2 J
C) 4.9 *10^-2 J
D) 9.8 * 10^-2 J
E) 1.4 J