JEE Main 2021 · 24 Feb · Shift 1 · Physics Q8

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PhysicsSingle correct+4 / -1Question 8 of 90

If the velocity-time graph has the shape AMB, what would be the shape of the corresponding acceleration-time graph ?

Velocity against time: a straight line falling from A (positive v) through zero down to a minimum M, then rising linearly back to B at the same level as A.

a constant and negative, then constant and positive (a single step up)

Option A: acceleration constant negative, then a jump to a constant positive value.

a sinusoidal curve, first negative then positive

Option B: acceleration varying sinusoidally, negative first then positive.

a square wave alternating between positive and negative values

Option C: acceleration a square wave switching between positive and negative values several times.

(no figure printed for this option)

Answer and worked solution

Official answer: A

Slopes. v falls at a constant rate from A to M (constant negative acceleration), then rises at a constant rate from M to B (constant positive acceleration): a single step from negative to positive.

(A)

Topics:Motion graphs

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JEE Main 2021 · 24 Feb · Shift 1, Physics question 8