David's new bike can accelerate from rest to 45.0 m/s in just 6.00 s. the combined mass of david and his bike is 225.43 kg. what is the magnitude of the net (unbalanced) force that can cause the acceleration?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

Which of the following list the divisions of the geologic time scale in order from longest to shortest