Question

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

Answer 1

Acceleration is :

a = 2.89 m/s2

Step-by-step 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=(1000)/(3600)m/s`

`1km/hr=(5)/(18)`

`100km/hr=(5)/(18)* 100`

`v=(5)/(18)* 100`

v = 27.78 m/s

u = 0 m/s

time = 9.60 s

The acceleration"a" is calculated using :

`a=(v-u)/(t)`

`a=(27.78-0)/(9.6)`

`a=(27.78)/(9.6)`

`a=2.89m/s^(2)`