Question

(i) Draw the position time garph for motion with zero acceleration .

(ii) Is it possible that velocity of an object be in a direction other than the direction of accelerations ?

(iii) The sum and difference of two vectors are equal in magnitude . what is angle between the two vectors ?​

Answer 1

Answer:

Useful points

> Acceleration zero , velocity constant . So position will change linearly

*2. Yes .

Assume an object going by some velocity and we try to stop it by applying force . Before it comes to rest it's velocity is opposite to acceleration.

Other example can be circular motion .

3.

let vectors x and y and angle between them is alpha , use formula for resultant

$|x + y| = |x - y| \\ \sqrt{ {x}^{2} + {y}^{2} + 2xy \cos( \alpha ) } = \sqrt{ {x}^{2} + {y}^{2} - 2 \cos( \alpha ) } \\ \cos( \alpha ) = 0 \\ \alpha = \frac{\pi}{2}$