Question

A roller coaster of mass 2000 kg is rolling down a track with an instantaneous speed 10m/s what is kinetic energy in Joules

Answer 1

The kinetic energy is 100,000 Joules, if a roller coaster of mass 2000 kg is rolling down a track with an instantaneous speed 10 $m/s$.

Explanation:

The given is,

              Mass - 2000 kg

              Instantaneous speed - 10 meter per second

Step: 1

            Formula to calculate the kinetic energy,

                          $K.E = \frac{1}{2} mv^{2}$....................(1)

           Where, K.E - Kinetic energy in joules

                           m - Mass in kg

                            v - Velocity or speed in meter per second

Step: 2

          From the give,

                  m = 2000 kg

                   v = 10 $m/s$

         Equation (1) becomes,

              $K.E = \frac{1}{2} (2000)(10)^{2}$

                       = (0.5)(2000)(100)

                       = 100000

                 K.E = 100,000 Joules

Result:

      The kinetic energy is 100,000 Joules, if a roller coaster of mass 2000 kg is rolling down a track with an instantaneous speed 10 $m/s$.