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## Homework Statement

An object is hanging by a [mass-less] string on a [mass-less] pulley from a cart on a desk with a mass of 1.8 kg. The cart has an acceleration of 2.5 m/s^2. Calculate the mass of the hanging object given that:

a) There is no friction.

b) There is a frictional force of 0.4 N on the wheels of the cart.

## Homework Equations

Fnet = ma

## The Attempt at a Solution

m1 = 1.8 kg

a = 2.5 m/s^2

m2 = ?

I don't know where to start with this question...

Maybe Fnet = (1.8 kg)(2.5 m/s^2) = 4.5 N ? But what would I do with this.

... I don't know.