A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is:
The percentage errors in the measurements of mass and speed are 2% and 3% respectively.How much will be the maximum error in the estimate of the kinetic energy obtained by measuring mass and speed.
The cables holding a passenger lift swap and lift falls freely towards the ground. A person inside the lift is standing on a weighing machine. What does he notice?