Question

Choose the one which is False.

1. If the speed changes, the velocity also changes.

2. If the speed changes, there is acceleration.

3. If the speed does not change, but the direction changes, there will be acceleration.

4. Motion with constant velocity is accelerated motion.

5.
Motion along a straight line is Linear motion.​

Answer 1

4

Step-by-step explanation:

1 is true. Speed is the magnitude of velocity so if the magnitude of velocity(speed) changes, then velocity changes itself.

2 is true.

`a _(avg) = (v _(f) - v _(i) )/(t)`

Since speed changes, the inital and final speeds are different, therefore we will have some nonzero acceleration because the numerator does not equal zero.

3 is correct, acceleration is a vector so it has direction, meaning if the direction of speed changes then we will have acceleration.

4. is false, a constant velocity has a acceleration of 0.

5 is correct, motion along a straight line is linear.