Question

solve these plezz (1,2)​

Answer 1

in 1st case

$mg \cos(30) = tension \\ so \: tension \: = 20 \times 10 \times \frac{1}{2} = 100 \\ in \: 2nd \: case \\ 4 \times g - t = 4a ....1\\ t - 6 \times g \cos(30) = 3a........2 \\ add \: both \: the \: eq \\ 70 = 7a \: = a = 10 \\ put \: the \: value \: of \: a \: in \: eq$