Aconstant driving force is applied to the car for the first 6 sec. at time t=16 sec the driver realises the car is travelling too fast for the 22 m s-1 speed limit (50 miles per hour and applies the break until time t=18 s.

a. calculate the acceleration at time t=3sec

Explanation:

The car accelerates at a constant rate during the first 6 seconds of the trip, so we can calculate its acceleration by using the equation:

where

v is the final velocity

u is the initial velocity

t is the time

For the first 6 seconds of the trip, we have: (from the graph)

v = 27 m/s

u = 14 m/s

t = 6 s

Substituting into the equation, we find:

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explanation:

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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