Question

the bus is moving to left slows down and then comes to a stop what is the direction of its acceleration is the acceleration is positive or negative what is the sign of acceleration that reduces the magnitude of the positive velocity

Answer 1

i) The direction of the acceleration is positive. Here, as the object slows down. The direction of acceleration will be towards the right. So, the direction of acceleration will be positive ie opposite to negative velocity.

(ii) Acceleration should be negative to reduces the magnitude of a positive velocity.

Answer 2

Explanation:

The acceleration of bus is given by :

$a=\dfrac{v-u}{t}$

Where

u is the initial speed of the bus

v is the final speed of the bus

t is the time taken by the bus

If final speed is less than the initial speed of the bus, the value of acceleration is negative. It is also known as retardation or deceleration.

Similarly, if the final speed of the bus is more than the initial speed of the bus, the value of acceleration is positive.

The bus is moving to left slows down and then comes to a stop, v = 0, so the acceleration is negative.

$a=\dfrac{0-u}{t}$

i.e. acceleration is negative.

Hence, this is the required solution.