Question

starting from rest a body attaions a speed 72km/hr in 10 sec then find acceleration ​

Answer 1

Explanation:

Acceleration = velocity/ time

a = v/t

72 km/hr = 72 × 5/18 = 20 m/sec

a = 20/10 = 2 m/sec^2

thanks.....❤

Answer 2

Remember,

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

Remember this formula.

and 72 km/h = 20m/s

Since, object start from rest the initial velocity is 0 m/s.

Now put the values in the formula.

$a = \frac{20 - 0}{10} \\ a = \frac{20}{10} \\ a = 2 \: m {s}^{ - 2}$

Clearly the acceleration comes as 2 m/s sq.