Suppose you have a 147-kg wooden crate resting on a wood floor. (For each answer, enter a number. ( = 0.3 and u, = 0.5) (a) What maximum force (in N) can you exert horizontally on the crate without moving it? N (b) If you continue to exert this force (in m/s*) once the crate starts to slip, what will the magnitude of its acceleration (in m/s ) then be? m/s2