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Q3. You throw a ball into the air, it reaches a certain height and then comes back to you.
(a) On the way up, what are the directions of the velocity and the acceleration? Does the ball speed up or slow down?
(b) On the way down, what are the directions of the velocity and the acceleration? Does the ball speed up or slow down?


Q4. (a) Is a car going around a curve at 50 km/hr experiencing acceleration? Explain why or why not.
(b) Is a skateboard coasting down a hill at 2 m/s experiencing acceleration? Explain why or why not.
(c) Is a car stopping at an intersection experiencing acceleration? Explain why or why not.

Sagot :

pstnonsonjoku

The If a car is going round a curve , there is an acceleration because the direction of the velocity changes.

What is the direction of the velocity?

Now we know that if you throw the ball upwards, the motion is in opposite direction to gravity thus the ball is experiencing deceleration and the speed decreases. The velocity decreases and the acceleration is negative.

If the ball is coming down, then the ball is accelerated thus it speeds up and the direction of the acceleration is positive.

If a car is going round a curve, the vehicle is accelerating because the direction of the velocity changes even if its amount remains constant.

When a board is moving down a hill at 2 ms-1, it is experiencing an acceleration because the motion is in the same direction as gravity.

If a car is coming to a stop at a point, it experiences a deceleration and not an acceleration since the change of velocity with time is negative as the car comes to rest.

Learn more about acceleration:https://brainly.com/question/12550364

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