Fa roller coaster at six flags had a car with a mass of 400 kg and a velocity of 50m/s, calculate the kinetic energy of the roller coaster

Kinetic Energy = (1/2) (mass) (speed)²

KE = (1/2) (400 kg) (50 m/s)²

KE = (200 kg) (2500 m²/s²)

KE = 500,000 kg-m²/s²

KE = 500,000 Joules

KE = 1/2 Mega-Joule

wavelength divides in half and speed stays the same.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)