Principal of conservations of energy is valid even if fricti

Principal of conservations of energy is valid even if frictional forces are present Either angular momentum is conserved or linear momentum is conserved but not both Elastic potential energy is always positive.

Solution

>> Solution (1)

Even in case of frictional energy presence, principle of conservation of energy is valid if frictional energy is also used in the equation

So, this equation is TRUE

>> Solution (2)

Both, linear and angular momentum can be conserved

So, FALSE

>> Solution (3)

As, Elastic Potential Energy = (1/2) kx² and

If now, x is negative or positive,

In either case, energy will be positive

So, this statement is TRUE