Question

a body of mass 6kg is made to fall freely from a height 18m .find its mechanical energy when it travels 1/3rd distance .

Answer 1

Hi friend,

We know that ,

Mechanical energy= potential energy+kinetic energy

Potential energy= mgh

= 6×10×6(18/3)

Potential energy= 3600J

Kinetic energy= 1/2 mv²

V²=u²+2as

V²= 2×10×6

V²= 120m/s.

Kinetic energy= 1/2×6×120

Kinetic energy= 360J

Mechanical energy= 3600+360

Mechanical energy= 3960J.

Hope this helped you a little!!!