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Wavefronts of Light

The displacem...

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The displacement of a body is given by s=1/2gt2 the velocity of the body at any time t is

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Q. The displacement of a body is given by

s = \frac{1}{2} g t^{2}

g

is acceleration due to gravity. The velocity of the body at any time

t

Q. The displacement of a body at any time

t

after starting is given by

s = 15 t - 0.4 t^{2}

. Find the time when the velocity of the body will be

7 m s^{- 1}

.

Q. Fig. shows the displacement-time graph for the motion of a body. Use it to calculate the velocity of body at

t = 1 s, 2 s

3 s

, then draw the velocity-time graph for the body.

Q. A body is moving in a straight line and its displacement at various instants of time is given in the following table :

Time (s)	0	1	2	3	4	5	6	7
Displacement (m)	2	6	12	12	12	18	22	24

Plot the displacement-time graph and calculate the average velocity in time interval 1 s to 5 s.

Q. The velocity-time graph of a body is shown below The displacement covered by body is

5 s

v (m / s)

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