d) the force applied by the boy needed to maintain the constant velocity.
Please do not just "drop off" problems. Show your work. Do you know what "the normal force" means? It is the component of the applied force that is perpendicular to the ground. Start by calculating that.
What are the names of the six basic types of quarks?
The six types of quarks are up,down,bottom,top,strange,and charm.
How fat must a mortar be shot to reach a target that is 800 meters fromthe base of the cliff?