A 60 kg painter stands on a 15 kg platform and pulls the free end of a rope downward; the rope passes over a fixed overhead pulley and its other end supports the platform. Which statements are correct? Take g=10 m s⁻².

Select all that apply

• Option A

  If the painter pulls with 400 N, the upward acceleration of painter-platform system is about 0.67 m s⁻².

• Option B

  For upward acceleration 1 m s⁻², the required pull is 412.5 N.

• Option C

  For upward motion at constant speed, the required pull is 375 N.

• Option D

  For constant speed the required pull is 750 N.