Phycics pleace 5 questions 30points

1) a car starts from a resting position and accelerates at a constant rate of 6 meters per second per second. what is the car's speed after it has traveled 250 meters?
a. 41.7 m/s
b. 54.8 m/s
c. 127.3 m/s
d. 1500 m/s

2) the speed of a boat undergoing constant acceleration increases from 5 meters per second to 15 meters per second over a period of 20 seconds. how far does the boat travel during this time?
a. 125 m
b. 150 m
c. 175 m
d. 200 m

3) a child throws a penny straight down into a wishing well. the penny's initial speed is 2 m/s. if the penny takes 3 seconds to hit the water, how deep is the well?
a. 20 m down
b. 46 m down
c. 50 m down
d. 94 m down

4) on mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.
a. 9.5 m
b. 11.9 m
c. 15.2 m
d. 23.8 m

5) on earth a rock falls an unknown vertical distance from a resting position and lands in a lake. if it takes the rock 2.5 seconds to fall, how high is the cliff that the rock fell from?
a. 24.5 m
b. 30.6 m
c. 38.1 m
d. 61.3 m