A body is said to be in mechanical equilibrium when the:
Weight is equal to the reaction force.
Sum of external forces on it is zero.
Resultant moment on the body is zero.
Resultant external force on it is zero and sum of moment is zero.
The figure shows an arrangement which is used to investigate collisions between two trolleys. Trolley B is initially stationary and the end of Y of the tape is closer to trolley A.
A ticker tape produced from this experiment will likely be:
B.
A.
D.
C.