According to Newton's Second Law of Motion, the acceleration $\vec{a}$ of an object is directly proportional to the net force ${\vec{F}}_{net}$ acting on it and inversely proportional to its mass $m$: ${\vec{F}}_{net}=m\vec{a}⟹\vec{a}=\frac{{\vec{F}}_{net}}{m}$ Given:

• $F_{net}=40\text{ N}$ (since the surface is frictionless, there is no opposing force)
• $m=10\text{ kg}$ Substituting the values: $a=\frac{40\text{ N}}{10\text{ kg}}=4{\text{ m/s}}^2$.