. Two blocks with masses
M1 and M2 of 10 kg and 20 kg respectively are placed as in figure, ms = 0.2 between all surfaces, then tension in string
A. 250 N, 3m/s2
B. 200 N, 6 m/s2
C. 306 N, 4.7 m/s2
D. 400 N, 6.5 m/s2
Sol: Since block M1 is attached to the string so it will remain stationary, M2 has tendency to move downward. So, friction on M2 will act in upward direction.
N is the force by which the both blocks are pressed i.e., N = T cos 30° for block M1