The acceleration of the cart is zero
Explanation:
There are 4 forces acting on the cart:
- The 3 forces of F=15 N each, applied forward by three boys
- The force of F'=45 N applied backward by the horse
So we can write Newton's second law of motion as:
where
m is the mass of the cart
a is its acceleration
Here we have
m = 20 kg
So we can solve the equation for a, the acceleration of the cart:
This means that the acceleration of the cart is zero, because the force applied by the horse perfectly balance the forces applied by the three boys.
Learn more about acceleration and forces:
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