State the Newton's second law of motion in words and in mathematical form. If a net external
force acts upon a particle, what is the ratio of the force to acceleration?
What is Newton's second law also called?
A truck of 2 000 kg mass moving at a velocity of 12 m s-1 slide 15 m before it comes to a stop
after applying the brakes. Find the resisting forces of the brakes.
(8-Marks)

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Consider a one meter long horizontal pipe with a constant 100 cm^2 cross sectional area. water flows rightward into the pipe at x = 0 with flow velocity 02m/sec at every point within the pipe intake area. at x=1, the rightward flow rate is 0.192 m/sec. assume the water is a conserved quantity in the pipe, so there must be a leak (a sink) somewhere in the pipe. 1. compute net volumetric flow of the source if the system to be in equilibrium. 2. now assume the pipe in the problem has no leaks. compute the net volumetric rate of change for the system.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.