Question

Which one of the following statements is correct for a moving body?

विकल्प

• If its velocity changes, its speed must change and it must have some acceleration.

• If its speed changes, its velocity must change and it must have some acceleration.

• If its speed changes but direction of motion does not change, its velocity will remain constant.

• None of the above

Answer 1

If its speed changes, its velocity must change and it must have some acceleration.

Explanation:

Since `vecv = speed xx hatv`

So, when speed charges, its velocity must charge.