Inertia is the natural tendency of every object to resist change to either speed or direction. Describe a way in which you observe this in your everyday life.

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

The ability to make things happen is also called a. heat b. force c. matter d. energy

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