Question

What is the acceleration of a7kg mass if a force of 68.6n is used to move it toward earth

Answer 1

In this case you must consider two effects: the action of the force and the effect of the weight of the object:


`F_T = m\cdot a\ \to\ f + p = m\cdot a\ \to\ a = (f + (m\cdot g))/(m)`


`a = (68,6\ N + (7\ kg\cdot 9,8\ m/s^2))/(7\ kg) = (137,2\ N)/(7\ kg) = \bf 19,6(m)/(s^2)`