The component of vector r → along x -axis will have maximum value if

r → is along positive X -axis

r → is along positive Y -axis

r → makes an angle of 45 ° with the X -axis

r → is along negative Y -axis

The component of vector r → along x -axis will have maximum value if

r → is along positive X -axis

If A → + B → = A → . this necessarily implies

A → , B → are perpendicular

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The component of vector $\vec{r}$ along $x$ -axis will have maximum value if

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Important Questions on Kinematics

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IMPORTANT

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

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

. this necessarily implies

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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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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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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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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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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?

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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 27

A bomb is dropped by a fighter plane flying horizontally. To an observer sitting in the plane, the trajectory of the bomb is a :

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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 28

A body is projected horizontally from the top of a tower of height

180 m

with a velocity of

20 {ms}^{- 1}

. If acceleration due to gravity is

10 {ms}^{- 2}

then match the following.

List-I		List-II
$(A)$	Velocity of the body after $1$ second $($ in ${ms}^{- 1}$ )	(I)	$5$
$(B)$	Horizontal displacement of the body after $1$ second (in meters)	(ii)	$20$
$(C)$	Vertical displacement of the body after $1$ second (in meters)	(iii)	$10$
$(D)$	Vertical velocity of the body after $1$ second $($ in ${ms}^{- 1}$ )	(iv)	$22.4$

The correct answer is

The component of vector r→ along x-axis will have maximum value if

Important Questions on Kinematics

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The component of vector $\vec{r}$ along $x$ -axis will have maximum value if