Here an object has mass of 20 kg which is changing it’s velocity from 5m/s to 2m/s. We know that work done is also equal to change in kinetic Energy. work Done = Change in kinetic Energy = Final kinetic Energy – Initial Kinetic Energy = W = ½ m v² − ½ mu² Mass … Read more

Here, Inside the battery there is a filling of chemical when we connect battery with a bulb through wire. A chemical reaction takes place inside the battery. This chemical reaction produce electric charges this electric charges flow throw wire then goes in to bulb then bulb produce heat and that sufficent heat produce light. Then … Read more

Here, question says we have to find the work done by only force of gravity. ( Gravitation Force ). Here students you can imagine that when an object is thrown in curved path then force is acting by gravitation towards the earth and displacement is going in horizontal position so angle between force and displacement … Read more