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(a) State newton’s first law of motion.
(b) A wooden block resting on a horizontal bench is given an initial velocity, u, so that it slides on the bench surface for a distance, n, before
coming to stop. The values of d were measured and recorded for various values of initial velocity.
Figure 10 shows the graph of #u^2# against d.
(i) Determine the slope, s, of the graph.
(ii) Given that #u^2#= 20kd, where k is constant for the bench surface, determine the value of k from the graph.
(iii) State how the value k would be affected by a change in the roughness of the bench surface.
(c) A car of mass 800kg starts from rest and accelerates at 1.2 #ms^-2#. Determine its momentum after it has moved 400m from the starting point.