In the figure the tension in the diagonal string is $60\,N$.Find the magnitude of the horizontal force $\overline{ F }_1$ and $\overline{ F }_2$ that must be applied to hold the system in the position shown.what is the weight of the suspended block?

Two masses of $10\,kg$ and $20\,kg$ respectively are connected by a massless spring as shown in figure. A force of $200\,N$ acts on the $20\,kg$ mass at the instant when the $10\,kg$ mass has an acceleration of $12\,ms ^{-2}$ towards right, the aceleration of the $20\,kg$ mass is:

What should be the minimum force $P$ to be applied to the string so that block of mass $m$ just begins to move up the frictionless plane.

If $n$ balls hit elastically and normally on a surface per unit time and all balls of mass $m$ are moving with same velocity $u$, then force on surface is ..........

Two blocks, each having mass $M$ rest on frictionless surfaces as shown in the figure. If the pulleys are light and frictionless, and $M$ on the incline is allowed to move down, then the tension in the string will be

The pulleys in the diagram are all smooth and light. The acceleration of $A$ is $a$ upwards and the acceleration of $C$ is $f$ downwards. The acceleration of $B$ is