Question

A bus decreases its velocity from 8 km/h to 60 km/he in 5 s . Find the acceleration
of the
the body.

Answer 1

GIVEN :

Initial velocity, u = 80 km/hr = 22.2 m/s

Final velocity, v = 60 km/h = 16.7 m/s

time, t = 5 sec.

TO FIND :

Acceleration, a = ?

FORMULA :

Acceleration, $\sf a \: = \: \dfrac {v-u}{t}$

SOLUTION :

u = 22.2 m/s

v = 16.7 m/s

t = 5 sec.

acceleration, a = ?

Here, u = Initial velocity.

v = final velocity.

t = time.

a = acceleration.

• Acceleration, $\sf \: a \: = \: \dfrac {v-u}{t}$

→ $a \: = \: 16.7 \: - \: \dfrac {22.2}{5}$

→ $a \: = \: \dfrac {-5.5}{5}$

→ $-1.1 \: m/s^{2}$

$\therefore$ The acceleration of the body is $-1.1 \: m/s^{2}$