A girl stands at A on a platform which is rotating with an angular acceleration α = 0.2 ra...

A girl stands at A on a platform which is rotating with an angular acceleration α = 0.2 rad/s2 and at the instant shown has an angular velocity ω = 0.5 rad/s. If she walks at a constant speed υ = 0.75 m/s measured relative to the platform, determine her acceleration (a) when she reaches point D in going along the path ADC, d = 1 m; and (b) when she reaches point B if she follows the path ABC, r = 3 m.