Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 18

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IMPORTANT

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The position vector of a particle is given by $\vec{r} = (2 \hat{i} + 3 \hat{j} + 4 \hat{k}) m$ . The magnitude of the position vector is

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Important Questions on Kinematics

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 19

The instantaneous coordinates of a particle are

x = (4 t) m

and

y = (8 t^{2}) m

. The acceleration of the particle is

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 20

The component of vector

\vec{r}

along

x

-axis will have maximum value if

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 21

If

|\vec{A} + \vec{B}| = |\vec{A}|

. this necessarily implies

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 22

A stone is released at rest from a height of

45 m

above the horizontal level ground. There is horizontal wind blowing due to which stone acquires an additional (in addition to acceleration due to gravity) horizontal acceleration of magnitude

10 m s^{- 2}

. Then the net distance travelled by stone before reaching the ground is (take

g = 10 m s^{- 2}

and neglect air resistance),

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 23

A particle has initial velocity

(2 \hat{i} + 3 \hat{j})

and acceleration

(0.3 \hat{i} + 0.2 \hat{j})

. The magnitude of velocity after

10

seconds will be

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 24

A projectile is projected vertically upward. The time of ascent of the projectile is

2 s

. The time of descent of the projectile is

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 25

At what angle

θ

to the horizontal should an object is projected so that the maximum height reached is equal to the horizontal range?

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 26

Two bullets are fired simultaneously, horizontally and with different speeds from the same place. Which bullet will hit the ground first?