18. Convert 55 miles per hour to kilometers per hour. Show your work

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader