MECHANICAL ENERGY
1.The sum of potential and kinetic energy of a system is known as mechanical energy E=U+K
where U is P.E and K is K.E
Here K is always positive and U may be positive or negative
2.The only mechanical energy abody at rest can have is potential energy
3.The body at rest cannot have kinetic energy and momentum
4.Mechanical energy may be positive (if K>U),negative (K<U and U is negative) or zero(if K=U and U
the inverse ratio of their masses i.e., \(
\frac{{K_{bullet} }}
{{K_{gun} }} = \frac{{M_{gun} }}
{{M_{bullet} }}
\)
Hence, the kinetic energy of the bullet is greater than that of the gun.