Pulling a box vertically

[future_vet]

Homework Statement

A box of mass 5.0 kg is pulled vertically upwards by a force of 68 N applied to a rope attached to the box. Find a) the acceleration of the box and b) the vertical velocity of the box after 2 seconds.

Homework Equations

ma = Force and a = T/m -g
a = 68/5 - 9.8 = 3.8 m/s^2

v = vo + axt
v = 0 + 3.8 x 2 = 7.6 m/s.

Does this look right?

Thanks!

 

[radou]

Yes, it does.

 

[future_vet]

Thank you!