Question

which of the following is true n which is not?? give reason for every answer

1. a body moving with uniform speed can have non uniform velocity

2. a body moving with uniform acc. can be at rest at any instant

3.a accelerating body may move with uniform speed

4. a body moving with constant velocity can have varying speed

Answer 1

1. True

Velocity has two components, speed and the direction. Even when the speed is constant, a changing direction will result in a non uniform velocity.

2. True

v = u + at

if u is positive and a is negative, the value of v will be zero at some point of time.

3.True

Same answer as first.

4. Not true

For the velocity to be constant, both speed and direction need to be constant.