.A roller coaster travels at a rate of 50m/s down a hill. The mass of the coaster is 1000kg. What is the coaster's
KE when it hits the bottom of the hill?

1250000J

Explanation:

Given parameters:

Mass of coaster  = 1000kg

Velocity  = 50m/s

Unknown:

K.E at the bottom of the hill  = ?

Solution:

The kinetic energy of a body is the energy due to the motion of the body. It is expressed as;

     K.E  = m v²

m is the mass

v is the velocity

At the bottom of the hill, the kinetic energy is at its maximum.

So, insert the parameters and solve;

        K.E  =    x 1000 x 50²  = 1250000J

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles