Question

The velocity of a moving body with uniform acceleration increases from 4ms-1 to 8ms-1 in two second. What will be the velocity of the body after 4 seconds?​

Answer 1

Answer:

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>>Motion in a Straight Line

>>Uniformly Accelerated Motion

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A body is moving with uniform velocity of 8 ms

−1

. When the body just crossed another body, the second one starts and moves with uniform acceleration of 4 ms

−2

. The time after which two bodies meet, will be

Medium

Solution

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Correct option is

B

4s

A→8m/s

B→4m/s

2

Let us observe the motion of A wrt B

So,

a

A/B

=−4m/s

2

u

A/B

=8m/s

For finding the time after they

will meet

Applying 2

nd

eq

n

of motion

0=(u

A/B

)t t

2

(a

A/B

)

t

2

⇒0=8t−

2

4

t

2

t

2

=4t

t=4 or 0

Option −B is correct.

Explanation:

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