Telangana Board Solutions for Chapter: Work and Energy, Exercise 1: Exercise 1

Draw a diagram to show conservation of mechanical energy in case of a free-falling body.

Find the mass of a body which has $5 \mathrm{J}$ of kinetic energy while moving at a speed of $2 \mathrm{m} {\mathrm{s}}^{-1}$.

A cycle together with its rider weighs $100 \mathrm{kg}$. How much work is needed to set it moving at $3 \mathrm{m} {\mathrm{s}}^{-1}$?

Which of the renewable sources of energy would you think suitable to produce in your native place? Why?

What is potential energy? Derive an equation for gravitational potential energy of a body of mass $m$ at a height $h$.

What is kinetic energy? Derive an expression for the kinetic energy of a body of mass $m$ moving at a speed $v$.

When you lift a box from the floor and put it on an almirah the potential energy of the box increases but there is no change in its kinetic energy. Is it violation of conservation of energy? Explain.

When an apple falls from a tree what happens to its gravitational potential energy just as it reaches the ground? After it strikes the ground?