Question

Which has a higher acceleration: a 10 kg object acted upon with a net force of 20 N or an 18 kg object acted on by a net force of 30 N

Answer 1

When a force F is acting on an object of mass m, the acceleration of the object is (Newton's second law)
$a= \frac{F}{m}$
The first object has a mass of 10 kg and a force of 20 N is acting on it, so its acceleration is
$a_1= \frac{20 N}{10 kg}=2 m/s^2$
The second object has a mass of 18 kg and a force of 30 N is acting on it, so its acceleration is
$a_2= \frac{30 N}{18 kg}=1.67 m/s^2$
So, the first object has higher acceleration.