Question

Q.8. When a car driver
travelling at a speed of 10 m/s
applies brakes and brings the
car to rest in 20 s, then the
retardation will be:
a. + 2 m/s2
b. - 2 m/s2
c. -0.5 m/s2
d. +0.5 m/s2​

Answer 1

Answer -

Given -

v = 0

u = 10 m/s

t = 20sec

To find -

Acceleration - a

Solution

By 1st equation of motion -

v = u + at

0 = 10 + 20a

20a = -10

$a = -1/2 m/s^2$

Thanks

Answer 2

Answer:

(c) -0.5 m/s²

Explanation:

u = 10

v = 0

t = 20s

a =?

a = v-u /t