Question

a car travels with a velocity of 25 metre per second and come to rest after 10 seconds calculate acceleration​

Answer 1

Answer:

2.5

Explanation:

a=v-u/t

=0-25/10

=2.5

Answer 2

Answer:

• -2.5m/s² is the required answer .

Explanation:

Given:-

• Initial velocity of car ,u = 25m/s
• Final velocity ,v = 0m/s
• Time taken ,t = 10 s

To Find:-

• Acceleration ?

Solution:-

As we know that acceleration is defined as the rate of change of velocity at per unit time .

✪ a = v-u/t

where,

• v is the final velocity
• a is the acceleration
• u is the initial velocity
• t is the time taken

Substitute the value we get

➺ a = 0-25/10

➺ a = -25/10

➺ a = -2.5 m/s²

Here, negative sign show retardation (acceleration in opposite directions)

• Hence, the acceleration of the car -2.5 m/s².