2 Masses on a Table Edge
Two blocks are positioned as shown above, and are released from rest.
Block A with mass M_{A}=40 kg can slide on the table without friction.
Block B has mass M_{B}=20 kg. The two blocks are connected by a massless
string of length 2 meters passing over ideal pulley.
An 'ideal' pulley is frictionless and massless. The 'massless string' also
cannot stretch or shrink. These simplifying assumptions allow us to focus on
fundamental aspects of the problem without getting bogged down with (less
fundamental) details. Perhaps you've heard the expression 'Let's take a
spherical cow'!
Assume that there is no friction anywhere in the system.
Positive directions of xaxis and yaxis are indicated by the arrows.
Given the magnitude and sign of gravitational acceleration
g= 9.8 m/sec^{2},
what is the sign and magnitude of acceleration a_{B} of block B,
as long as block A remains on the table?
a_{B} = m/s^{2}
