A ball is thrown straight up. Which of the following statements about its velocity and acceleration is true during its flight (ignoring air resistance)?i. The velocity is always in the same direction as the acceleration.ii. The acceleration is always directed upward.iii. The acceleration is always directed downward.iv. The velocity is zero at the highest point.Select one:a.(i) and (iii) onlyb.(iii) and (iv) onlyc.(iv) onlyd.(ii) and (iv) onlye.(i), (iii) and (iv) only
Question
A ball is thrown straight up. Which of the following statements about its velocity and acceleration is true during its flight (ignoring air resistance)?i. The velocity is always in the same direction as the acceleration.ii. The acceleration is always directed upward.iii. The acceleration is always directed downward.iv. The velocity is zero at the highest point.Select one:a.(i) and (iii) onlyb.(iii) and (iv) onlyc.(iv) onlyd.(ii) and (iv) onlye.(i), (iii) and (iv) only
Solution 1
The correct answer is b. (iii) and (iv) only.
Here's why:
i. The velocity is not always in the same direction as the acceleration. When the ball is thrown upwards, its velocity is upwards but the acceleration (due to gravity) is downwards.
ii. The acceleration is not always directed upward. In fact, the acceleration due to gravity is always directed downward.
iii. This statement is true. The acceleration is always directed downward because of gravity.
iv. This statement is also true. The velocity is zero at the highest point. This is the point where the ball stops moving upwards and starts falling back down.
So, the correct answer is b. (iii) and (iv) only.
Solution 2
The correct answer is b. (iii) and (iv) only.
Here's why:
i. The velocity is not always in the same direction as the acceleration. When the ball is thrown upwards, its velocity is upwards but the acceleration (due to gravity) is downwards.
ii. The acceleration is not always directed upward. In fact, the acceleration due to gravity is always directed downward.
iii. This statement is true. The acceleration is always directed downward because of gravity.
iv. This statement is also true. The velocity is zero at the highest point. This is the point where the ball stops moving upwards and starts falling back down.
So, the correct answer is b. (iii) and (iv) only.
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