Will someone please help me with these Physics questions.

Question

The Olympic record for the marathon is 2.00 h, 2.00 min, 57.0 s. A marathon is run over a distance of 42,195 m. What was the average speed of this record setting runner in m/s? Remember(60 mins in 1 hr and 60 seconds in 1 min).

a. 5.44 m/s

b. 7.45 m/s

c. 3.86 m/s

d. 5.72 m/s

The graph below shows the motion of go cart moving in a straight line across a field. Which best describes the vehicle's motion between 4 and 6 seconds?

a. moving uphill

b. constant velocity

c. changing velocity

d. constant acceleration

Now that you know this follow this steps to solve the problem: A cannonball is shot out of a cannon at 0º to the horizontal of a cliff with an initial speed of 25.0 m/s from a height of 40 m. How far away from the cliff does the cannonball land? 

a. 25 m

b. 229 m

c. 1125 m

d. 71.3 m

Reading the data provided, does this object move at a constant rate? 

a. Yes, because the best fit line matches a linear relationship.

b. No, because the dots are not all on the line.

c. Yes, the best fit line is exponent.

d. No, because the best fit line should be quadratic.

Answer 1

The first question is asking for velocity, which is defined as meters per second, as shown in your answer choices. The first thing you need to do is convert everything to a similar unit of seconds.

2 hours, 2 minutes, and 57 seconds = 122 minutes and 57 seconds = 7,320 + 57 = 7,377 seconds.

During this tie, 42,195 meters were covered. Since you now have all the appropriate unit conversions, the answer is 42,195 meters per 7,377 seconds. However, since this is not a simplified answer, you should look to simplify it, which roughly is 5.72 m/s (Choice D)

The second questions requires you to look at the graph and note the changes between 4 and 6 seconds. In 2 seconds, the change in position is 80 to 90m. In 2 seconds, 10 meters have been traveled by the cart. During this time, the cart experienced a velocity of 10 meters / 2 seconds = 5 m/s. This velocity is constant during 4 - 6 seconds. Therefore your answer is B.

The third question deals with projectile motion. If you would like additional help, please message me. Good luck!