Question

A roller coaster has a velocity of 10 m/sec at the top of the hill. Two seconds later it reaches the bottom of the hill with a velocity of 20 m/sec. What is the acceleration of the roller coaster?

Answer 1

Answer:

acceleration is 5 m/s²

Explanation:

We have given that ,

              u = 10 m/s at the top

              v = 20 m/s at the bottom

     Now time taken is 2 s to reach the bottom,

              t = 2 s

First equation of motion is ,

              v = u + at

Now , putting the values in above equation , we get ,

              20 = 10 + 2a

           => 2a = 10

           => a = 5 m/s² (Ans.)

                                        @Nihar

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Answer 2

Explanation:

the formula os acceleration is v/t - u/t. then, 20/2 - 10/2 = 5. so the answer is 5 m/s²