Two cubes of masses `m_(1)` and `m_(2)` lie on two frictionless slopes of the block A which rests on horizontal table. The cubes are connected by a string, which passes over a pulley as shown in the figure-2.67. To what horizontal acceleration "f" the block accelerates so that the cubes do not slide down the planes ? What is the tension in the string in this situation ?

`[f=g((m_(1)sinalpha+m_(2)sinbeta)/(m_(1)cosalpha+m_(2)cosbeta)),T = (m_(1)m_(2)gsin(alpha-beta))/(m_(1)cosalpha+m_(2)cosbeta)]`