A car is travelling with a velocity 90 km/hr and other with 72 km/hr in opposite direction, find the relative velocity between them

Which of the following represents a virtual image?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?