The velocity-time graph of a particle is shown. If its average speed for 6 s is b and its average acceleration from 0 s to 4 s is c, find the magnitude of bc, in m² s⁻³.

Question

G1 Physics · Accepted Answer

From the v-t graph, total distance in 6 s is the sum of absolute triangular areas =30 m, so average speed b=30/6=5 m s⁻¹. From 0 to 4 s, acceleration c=[10-(-10)]/4=5 m s⁻². Therefore |bc|=25 m² s⁻³.