Which of the following objects in the universe is made of billions of stars held together by gravity? A. Asteroid
B. Solar system
C . Galaxy

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Could someone . i have tried to solve myself but my calculation is off