According to newton's second law "force is the product of mass and acceleration".
Force = mass x acceleration
Now, the mass of the sports car is lesser compared to that of the truck. Therefore, to take both automobiles to the same speed, enough force must be applied by the engine of the truck.
There must be an increase in the force in order to make both automobiles attain the same speed.
they meet from the girl's original position at: 2.37 (meters)
Explanation:
We need to use the Newton's law, exactly the second law that relate force, mass and acceleration as: with this we can get both accelerations; solving for acceleration . Now and. Then knowing that they both travel at the same time and assuming that the distance among the girl and the sled is: 15.0-x, so, and, solving for the time we get: and with this equations we solving for the x that is the distance between the girl and the sled after the apply the force and we get:. Finally we get: and replacing the values we have got: so so x=2.37 (meters).