Question

A car travel with uniform velocity of 20m/sec. The driver applies the breaks and the car moves to rest in 10sec. Calculate regardation

Answer 1

Answer:

In the given question

u=20m/s

v=0m/s

t=10s

and a=?

we know the formula v =u + at

so putting the values we get

0 = 20 + a X 10

- 20 = 10 a

-2 = a

we get acceleration is -2 so retardation will be +2 m/ sec sq.

Answer 2

Answer:

$\mathfrak\blue{Given}$

• u = 20m/s

• v = 0m/s

• t = 10sec

$\mathfrak\blue{To\:find}$

• retardation = ?

$\mathfrak\blue{Solution}$

➙ retardation = $\frac{final velocity - initial velocity}{time}$ ⇐$\mathbb\red{FORMULA}$

➙ r = $\frac{0 m/s - 20 m/s}{10sec}$

➙ r = $\frac{-20m/s}{10sec}$

➙ r = $-2m/s^{2}$

$\mathbb\red{AnsWer}$

~ $-2m/s^{2}$