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A body starts from rest and is uniformly accelerated for $30 s$ . The distance travelled in the first $10 s$ is $x_{1}$ , next $10 s$ is $x_{2}$ and the last $10 s$ is $x_{3}$ . Then $x_{1} : x_{2} : x_{3}$ is the same as

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Important Questions on Kinematics

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 71

A ball is dropped from the top of a building. The ball takes

0.5 s

to fall past the

3 m

height of a window some distance from the top of the building. If the speed of the ball at the top and at the bottom of the window are

v_{T}

and

v_{B}

respectively, then

(g = 9.8 m s^{- 2})

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 72

A stone is released from an elevator going up with acceleration

a

and speed

u

. The acceleration and speed of the stone just after the release is

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 73

The initial velocity of a particle is given by

u

(at

t = 0

) and the acceleration by

f

, where

f = a t

(here

t

is time and

a

is constant). Which of the following relations is valid?

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 74

A stone is dropped into a well in which the level of water is

h

below the top of the well. If

v

is the velocity of sound, the time

T

after dropping the stone at which the splash is heard is given by,

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 75

A student determined to test the law of gravity for himself walks off a skyscraper

320 m

high with a stopwatch in hand and starts his free fall (zero initial velocity).

5 s

later, superman arrives at the scene and dives off the roof to save the student. What must be superman's initial velocity in order that he catches the student just before reaching the ground? [Assume that the superman's acceleration is that of any freely falling body.]

(g = 10 m s^{- 2})

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 76

A student determined to test the law of gravity for himself walks off a skyscraper

320 m

high with a stopwatch in hand and starts his free fall (zero initial velocity).

5

seconds later, superman arrives at the scene and dives off the roof to save the student. [Assume that the superman's acceleration is that of any freely falling body

(g = 10 m s^{- 2})

, what must be the maximum height of the skyscraper so that even superman cannot save him.

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 77

Two particles held at different heights

a

and

b

above the ground are allowed to fall from rest. The ratio of their velocities on reaching the ground is,

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Alpha Question Bank for Engineering: Physics>Chapter 4 - Kinematics>Exercise - 1>Q 78

In the displacement-time graph of a moving particle shown, the instantaneous velocity of the particle is negative at the point is,

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A body starts from rest and is uniformly accelerated for 30 s. The distance travelled in the first 10 s is x1, next 10 s is x2 and the last 10 s is x3. Then x1:x2:x3 is the same as

Important Questions on Kinematics

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A body starts from rest and is uniformly accelerated for $30 s$ . The distance travelled in the first $10 s$ is $x_{1}$ , next $10 s$ is $x_{2}$ and the last $10 s$ is $x_{3}$ . Then $x_{1} : x_{2} : x_{3}$ is the same as