Question

a 40 watt bulb turns half the electrical energy it uses into lighrt energy.how much light energy does it give out in ten second?

Answer 1

If two objects are moving in parallel their relative velocity can be calculated. For example, two cars are moving in the same direction along a road. Car A is travelling at +30 m/s and Car B is travelling at +20 m/s. Their relative velocity is 30 – 20 = +10 m/s.