How long will it take a skateboarder with a speed of 9 m/s to stop if decelerating at a rate of -2 m/s? a. 4.5 seconds. b. 3 seconds. c. 2.25 seconds. d. 1.5 seconds.

Question

asked May 9, 2024 183k views

1 Answer

Adam Robinsson · Answer 1 · 2024-05-13T14:13:55+0000

The skateboarder will take 4.5 seconds to stop if decelerating at a rate of -2 m/s.

To find the time it takes for the skateboarder to stop, we can use the formula:

final velocity = initial velocity + (acceleration x time)

Since the skateboarder is decelerating at a rate of -2 m/s, the acceleration is -2 m/s².

Plugging in the values, we have:

0 = 9 + (-2 * time)

Simplifying the equation, we get:

time = 4.5 seconds

Therefore, the answer is Option a. 4.5 seconds.