A roller coaster with a mass of 1000 kg is shot to a speed of 30 m/s in 8 seconds. How much kinetic energy does this coaster have at the end of the 8 seconds?

450,000 Joules

Explanation:

KE = 1/2 * m * v^2

KE = 1/2 * 1000kg * (30m/s)^2

    = 1/2 * 1000 * 900 kg*m^2/s^2

    = 450,000 Joules

(the 8 seconds is a red herring - you don't need to know that)

i think its c if i'm wrong

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.