The average velocity of the car in 6 seconds?

Gunpowder residue is most likely to show up where on a shooters hands

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?