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Ask Motion In A Plane question free ×

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• KERALA×
• Class 11 Science×
• Physics×
• Motion In A Plane×

# Motion In A Plane Free Doubts and Solutions

## From the top of a cliff a ball is projected with a velocity of 24 m/s in a horizontal direction.At this instant a car at rest at a location 90m from the clif accelerates from rest at a constant acceleration of 4.0m/s^(2) toward the cliff.the ball hits the car. (a)How long is the rock in the air? (b)How high is the cliff?

Asked by mythili Suresh 26th September 2015, 10:14 AM

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## So when the body moves up, acceleration= -g and the graph looks like what was drawn before for a decelerating body. Then when the body is moving downwards, acceleration= +g , now why does this graph have a curve similar to a decelerating body? Shouldn't the curve of this graph be in the opposite direction? How can I insert images here? It will be much easier to explain the question if I can upload images.

Asked by Deebu 20th March 2015, 1:36 PM

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## So if the shape is similar to that seen in an upwardly projected body doesn't it mean that the body is decelerating as it moves up and then continues to decelerate as it reaches maximum height and come back down? When a body is projected vertically upwards it is undergoing negative acceleration,right? After reaching maximum height when the object starts moving down is it still undergoing negative acceleration? Please explain.

Asked by Deebu 19th March 2015, 1:32 AM

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## If you draw the (s-t) graph of a decelerating body what will it look like?

Asked by Deebu 17th March 2015, 2:54 PM

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## In an displacement time graph doesn't the kind of curve shown above mean deceleration? So should the graph mean that when a body is projected vertically upwards the body is decelerating till it reach maximum height and the it is again decelerating downwards? How is this possible? when the body comes down from maximum height shouldn't the body be "accelerating" (because of the gravitational pull of the sun)? In the graph why does it look as if the body is decelerating?

Asked by Deebu 15th March 2015, 2:31 PM

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## Two balls released simultaneosly from a certain height, one is allowed to fall freely and other thrown with some horizontal velocity initial .

Asked by 10th February 2012, 9:23 PM

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## work done by a centripetal force is zero.why?

Asked by 20th December 2011, 2:31 PM