Your car is skidding to a stop from a high speed. name all the forces that apply

Abody of weight 60 kg is standing in a lift the lift going upward with a uniform velocity of 4.9 metre per second slows down and stops in two seconds then apparent weight of the body during the slow down process is

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

What are similarities and differences between refraction, reflection, diffraction and absorption?