A ball of mass 2kg is projected vertically up with a speed of 2 m/s and it comes back to - Science - Work and Energy

Question

A ball of mass 2kg is projected vertically up with a speed of 2 m/s
and it comes back to the ground with a speed of 1m/s The work done
by air friction force is

Roop Narayan · Accepted Answer

Dear studentat the point of throwing, (let us take thispoint to be PE=0)Net energy = KE only=12mv2=122×4=4Jat the same point when the call returns,Net energy= KE only=12mv2=122×1=1JEnergy lost=3JThis is the amount of work dne by the air frictionregards

A ball of mass 2kg is projected vertically up with a speed of 2 m/s and it comes back to the ground with a speed of 1m/s. The work done by air friction force is