Question

A car can accelerate from a standstill to 100 km/h [E] in 9.60s. calculate the average acceleration

Answer 1

Answer:

Acceleration is :

a = 2.89 m/s2

Explanation:

Acceleration : It is the change in the velocity of the object per unit time.

The object starts from the rest , so the initial velocity of the object is zero.

Initial velocity , u = 0

Final velocity = 100 km/h

Change the velocity to m/s because[ time unit is in second(9.60 s)]

1 km = 1000 m

1 hour = 60 x 60 sec = 3600 sec

$1km/h=\frac{1000}{3600}m/s$

$1km/hr=\frac{5}{18}$

$100km/hr=\frac{5}{18}\times 100$

$v=\frac{5}{18}\times 100$

v = 27.78 m/s

u = 0 m/s

time = 9.60 s

The acceleration"a" is calculated using :

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

$a=\frac{27.78-0}{9.6}$

$a=\frac{27.78}{9.6}$

$a=2.89m/s^{2}$