Two balls roll off the table at the same time and free fall to the ground. Ball A is moving at 1 m/s when it rolls off the table. Ball B is moving at 2 m/s when it rolls off
the table. Which ball hits the ground first?
a. Ball A.
b. Ball B.
c. The two balls land at the same time.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?