please explain all,

How many forces act on object B of the following figure? D 0 1 02 0 3 0 4 O More than 4 QUESTION 18 How many forces act on object C of the figure? 01 0 3 O More than 4 QUESTION 19 What is the direction of force friction on block C due to block B 7 Ob OC O dooesn't change O None of theseMore than 4 QUESTION 19 What is the direction of force friction on block C due to block B ? Ob O dooesn't change O None of these QUESTION 20 "Assume MA = 4 kg, Me = 1kg. Mc= 5 kg, and Mp = 2 kg. What is the magnitude of the force of friction exerted by C on B . if D is accelerating down at 1 mis27" 0 98N Q 196N @ less than 9.8 N More than 19.6 N None of these QUESTION 21 What is the tension in the cord connecting B to D 7 Q 9BN D less than 9.8 N More than 10 0 N @ None of those QUESTION 22 is speed of an object having a momentum of 15.6 ky mistO less than 9.8 N O More than 19.6 N O None of these QUESTION 21 What is the tension in the cord connecting B to D ? O 9.8 N O 19.6 N O less than 9.8 N O More than 19.6 N O None of these