Question

Question #4aba8

Answer 1

Box B must have a mass 1.0 kg

Explanation:

This is only possible if Box A is experiencing some friction.
Since you mention there is Box B, then Box must have a mass of 1.0 kg asking there are not friction acting on the boxes.

`F_"net" = m a`

`30 N = (2.0 kg + m_B) * 10 m/s^2`

`30N = 20N+ 10 m_B [m]/s^2`

`cancel(10) m_B [m]/s^2= cancel(10) N`

`1N = 1 (kg*m)/s^2`

`m_B cancel ([m]/s^2)= 10 kg*cancel(m/s^2)`

`m_B = 1.0 kg`