Page $16$

P$87$

Block A$,$ with a mass of $4\mathrm{.}2$ kg $,$ is suspended from a vertical string as shown in Figure $10.$ The string passes over a pulley and is attached to block B$.$ The mass of block B is $1\mathrm{.}8$ kg $.$ The pulley and the surface of the ramp are essentially frictionless. Calculate

$($a$)$ the acceleration of the blocks and

$($b$)$ the tension in the string. TII$[$ans: $($a$)5\mathrm{.}3\frac{m}{s}2$; $($b$)$

$19$ N