A roller coaster is travelling 1 m/s at the top of the track. At the bottom of the track, 5 seconds later, it is travelling 36 m/s. What is the average acceleration? 7.2 m/s2
0.14 m/s2
36 m/s 2
7 m/s2

Given values:

Top velocity,

Bottom velocity,

Time,

The acceleration is:

→

By putting the values,

Thus the answer above i.e., "option d" is correct.

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7m/s²

Explanation:

Given parameters:

Velocity at the top = 1m/s

Velocity at the bottom  = 36m/s

Time  = 5s

Unknown:

Average acceleration = ?

Solution;

Acceleration is the rate of change of velocity with time. It is expressed as;

  A =

v is the velocity at the top

u is the velocity at the bottom

t is the time taken

 Now, insert the parameters and solve;

  A =   = 7m/s²

there are no contact forces mentioned on the list of choices that you've provided.