2
2 2
2
2 2
2
2
2
2
(c) A second particle, R, moves along the x-axis so that its position at any time t is given by a differentiabl
function x(t), where xR(1) = 4 and XR(3) = 8. Explain why there must be a time t, for 1 < 1 < 3, at
which the velocity of particle R is 2.