6.3 The acceleration components in the n and taxis of the n-t coordinate system are (a) n-component: a,=v?/p=pB ?=vB (b) t-Component: a, = Ve, 6.4 The acceleration components in the r and 0 axis of the polar coordinate system are (a) r-component: a=r-r 02 (b) 0-Component: ag = r0 +2r0