An arrow of mass 20g traveling horizontally strikes a block of wood of mass 1980g resting on a horizontal surface. The impact takes 0.2s before the two move together with an initial velocity of 5m/s. Calculate: a. The velocity of the ...

How come in free fall you feel weightless even though gravity is pulling down on you?

Suggest two methods of improving the efficiency of a machine.

A ball ? is always in neutral equilibrium. Explain.

Distingush between Bernoulli’s effect and Bernoulli’s principle.

helicopter of mass 3000kg rises vertically at a constant speed of 25m/s if the acceleration due to gravity is10m/s2 ,determine the resultant force working on the helicopter