A teenager with mass of 51 kg pushes backward against the ground with her foot as she rides her skateboard. This exerts a horizontal force of magnitude Fpush. When a frictional force of 2.3 N is present the skateboard accelerates at 0.198 m/s2. If the skateboard has a mass of 2.1 kg, what is the magnitude of Fpush? Answer in N.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving