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  4. A ball is projected vertically upwards. Which graph in the figure represents the velocity of the ball during its flight when air resistance is ignored? <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/7d7cbd1a0365c5172ffccbe3b1c71b53-.png /> <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/d3b39b1ad1c0e255cd3386217c0be3be-.png />

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Q. A ball is projected vertically upwards. Which graph in the figure represents the velocity of the ball during its flight when air resistance is ignored?
image image

Motion in a Straight Line

Solution:

The ball during its flight is under uniform acceleration of g, downwards. If we take up as positive, then acceleration is negative. So the slope of v-t graph must be negative. Further when the ball goes up, its velocity goes on decreasing and becomes zero. Thereafter its direction changes or velocity becomes negative.