Question

a ball was initially at rest and found to be moving with a speed of 10 metre per second in 4 second calculate the acceleration​

Answer 1

Given:-

Initial velocity(u)=0

Final velocity(v)=10m/s

Time(t)=4s

To find:-

Accleration(a)

Solution:-

We know that----

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

$a = \frac{10 - 0}{4}$

$a = \frac{10}{4}$

a=2.5m/s²

Answer 2

Answer:

Explanation:

Correct Question,

A ball was initially at rest and found to be moving with a speed of 10 m/s in 4 s. Calculate the acceleration​.

Solution,

Here, we have

Initial velocity of ball, u = 0 m/s (As ball was in rest)

Final velocity of ball, v = 10 m/s

Time taken by ball, t = 4 seconds

To Find,

Acceleration of ball, a = ?

According to the 1st equation of motion,

we know that,

v = u + at

so, putting all the values, we get

v = u + at

⇒ 10 = 0 + a × 4

⇒ 10 = 4a

⇒ 10/4 = a

⇒ a = 2.5 m/s²

Hence, the acceleration of ball was 2.5 m/s².