Question

PLS I NEED HELP ASAP
A rollercoaster speeds up from rest to 100mph (45m/s) in 1.2s. (Acceleration=37.5)
The rollercoaster car then travels vertically upwards, and decelerates at 10m/s^2
How much time passes before it is stationary (for a moment)?

Answer 1

Answer:

5.7s

Explanation:

it is stationary when v = 0 so use the equations of motion to find t. Please see photo attached

Answer 2

The time passed before it is stationary (for a moment) will be 5.7s.

What is acceleration?

Acceleration is defined as the rate change of velocity with time.

acceleration a = (Δv) / (Δt)

A rollercoaster speeds up from rest to 100mph (45m/s) in 1.2s. The rollercoaster car then travels vertically upwards, and decelerates at 10m/s^2

Time taken for the change in speed is t.

The acceleration is given by

-10= (45 -0)/ t

t = 4.5

Total time passed = 4.5 +1.2 = 5.7s

Thus, the time passed is  5.7s.

Learn more about acceleration.

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