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JEE PHYSICS MCQ: MOTION IN PLANE

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Three vectors

\overrightarrow A ,\,\,\overrightarrow B ,\,\,\overrightarrow C

satisfy the relation

\overrightarrow A .\overrightarrow B \, = 0

and

\overrightarrow A \,.\,\overrightarrow C = 0

. The vector

\overrightarrow A

is parallel to

View answer and explanation

Correct option: D

\overrightarrow B \times \overrightarrow C

Option D is correct because if

\overrightarrow A . \overrightarrow B = 0

and

\overrightarrow A . \overrightarrow C = 0

, then

\overrightarrow A

is perpendicular to both

\overrightarrow B

and

\overrightarrow C

, meaning it's parallel to their cross product

\overrightarrow B \times \overrightarrow C

.

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is Assertion: The necessary condition for motion in two dimensions, velocity and acceleration vectors should have any angle between

0^{\circ}

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\mathrm{If}\,(\mathbf{a}+3 \mathbf{b}) \cdot(7 \mathbf{a}-5 \mathbf{b})=0

(\mathbf{a}-4 \mathbf{b}) \cdot(7 \mathbf{a}-2 \mathbf{b})=0

. Then, the angle between

\mathbf{a}

\mathbf{b}

is At the top of the trajectory of a projectile, the direction of its velocity and acceleration are A ball is thrown at an angle

\theta

and another ball is thrown at an angle

\left(90^{\circ}-\theta\right)

with the horizontal direction from the same point with velocity

39.2 \mathrm{~ms}^{-1}

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{g}=9.8 \mathrm{~ms}^{-2}

. Assertion: The drover in a vehicle moving with a constant speed on a straight road is in a non-inertial frame of reference.

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