A truck of mass M is moved under a force F. If the truck is then loaded with an object equal to the mass of the truck and the driving force is halved, then how does the acceleration change?

Given, The initial mass m₁ = M

Initial force, f₁ = F

Given that, new mass m₂ = M + M = 2M and new force f₂ =

Now, F = m×a

a =

Initial acceleration (a₁) =

New acceleration (a₂) =

Change in acceleration = = = 4

Therefore, = 4

= a₂

Thus, the new acceleration will be one–fourth of the old acceleration.