Question

Can anyone please solve the 11th question urgently?

Answer 1

since the direction of acc. is shown , net force on mass 4 kg

$mg - t2 = 4a$
i.e. 39.2-T2=4a. .....(i)

the net force on mass 8kg block

$t2 - t1 = 8a$
and the net force on mass 2kg
T1-19.6=2a. ....(ii)

now .
T1=19.6+2a
substitute its value in t2-t1=8a
t2-19.6-2a=8a
i.e. t2-19.6=10a. ....(iii)

now adding eq.(i) and (iii)
a = 1.4
Ans. is 1.4 m s-2