Question

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

Answer 1

new acceleration will become 1/4 times the initial acceleration

Answer 2

let the mass of truck = M 
force = F 
acc = F/ M 

now acc" when F' = F/2   and M' = 2M
acc"= F' / M' 

acc"= F/ 4M 

acc"= 1/4 acc