A cannon shoots a 40 kg ball at a sailing ship and when it hits the wall of the vessel it applies 2000N of force. How much was it
decelerated?

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

Coal contains energy. a. light b. kinetic c. chemical d. mechanical

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness