As the temperature of a gas sample at constant pressure increases, the volume of the gas will and there will be gas particles in the same space. The density of a gas at constant pressure therefore as the temperature increases.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

graph question answered .. you think better when you are relaxed and happy