Question

18. How does the application of brakes on a car
affect its velocity?
19. In question 18, what is the sign of acceleration?​

Answer 1

Answer:

The sign of acceleration is negative.

Explanation:

As brakes are tend to decrease the velocity of the car, they apply a frictional force in the opposite direction of the velocity.

This force decreases the velocity, hence a negative change in velocity i.e negative acceleration is observed.

We know,

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

If v ( final velocity ) < u ( initial velocity ), then it is negative acceleration.

Answer 2

Answer:

zero point something ..................