Question

A body starts with velocity'u' and moves on a straight path with constant acceleration. When its velocity becomes 5u' the acceleration is reversed in direction without change in magnitude. When it returns to starting point, its velocity becomes​

Answer 1

Answer:

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Answer 2

Explanation:

When the body is moving forward,

(5u)

2

−u

2

=2as

⇒25u

2

−u

2

=2as

Similarly, when the direction is reversed, after travelling the same distance

v

2

−(5u)

2

=−2as

From the two equations, we get

v=u

Since the direction is opposite to the first direction, velocity at the starting point is −u