I need actual help, not just the answers. I need explanations and formulas please.

1. The mass of a certain neutron star is 2x10^30 kg and its radius is 6000m. What is the acceleration of gravity?

2. Convert 25 ms to ns. 1ns=1x10^-6 ms.

3. Erica kicks a soccer ball 12 m/s horizontally from the edge of the roof of a building which is 30 m high. How long will it take for the ball to reach the ground?

4. If a car accelerates from 24.4 km/h to 52.7 km/h in 8.5 seconds and the tires have an angular acceleration of 4.932 radians/sec^2, what is the radius of the tires?

5. If a gas occupies 2L at 32 degrees celsius, what temperature is required for the gas to occupy 12L of space?

Please include formulas and explanations so I can really learn this please. Thank you so much!!