Comets are typically ? a.) chunks of ice that begin to vaporize if they pass close to the sun.

b.) slushy mixtures of liquid and ice.

c.) gaseous bodies from which some of the gas is pushed out by the sun to form a long tail.

d.) chunks of rock that are generally a few tens of kilometers in diameter.

??? i appreciate those that help!!! <3

p. s. this subject is astronomy it just doesnt have it as a subject option nor a science option

In the middle of the night you are standing a horizontal distance of 14.0 m from the high fence that surrounds the estate of your rich uncle. the top of the fence is 5.00 m above the ground. you have taped an important message to a rock that you want to throw over the fence. the ground is level, and the width of the fence is small enough to be ignored. you throw the rock from a height of 1.60 m above the ground and at an angle of 54.0 degrees above the horizontal. part a part complete what minimum initial speed must the rock have as it leaves your hand to clear the top of the fence? express your answer with the appropriate units. part b for the initial velocity calculated in the previous part, what horizontal distance beyond the fence will the rock land on the ground?