Question

Three blocks of masses 1.0, 2.0, and 4.0 kilograms are connected by massless strings, one of which passes over a frictionless pulley of negligible mass, as shown below. Calculate The acceleration of the 4.0 kilogram block.

Answer 1

There's also an image

Answer 2

4g-T=4a
T-3g=3a
4g-(3g+3a) = 4a
g=7a
a=g/7

Answer 3

@Algebraic! Where did you get T - 3g = 3a

Answer 4

The acceleration and tension is the same on the left?

Answer 5

sum of forces = ma

Answer 6

T-3g =3a

Answer 7

try to do all your pulley problems like that. much easier when direction is always consistent.