Question

a body changes its speed from 20 m/s to 30 m/s in two seconds. find distance travelled in two seconds​

Answer 1

Answer:

Distance travelled in two seconds = 50 m.

Explanation:

Given,

A body changes its speed from 20 m/s to 30 m/s in two seconds.

To find: Distance travelled in two seconds​

Solution:

Acceleration is rate of change of velocity.

or, a = ( v - u) / t

here, v = 30 m/s , u = 20 m/s and t = 2 sec

Substituting the values,

a = (30-20)/2 = 10/2 = 5 m/s²

Now, From second equation of motion,

S = ut + 1/2 at²

S = 20*2 + (1/2) * 5 * 2 * 2

S = 40 + 10

S = 50 m

Therefore, Distance travelled in two seconds = 50 m.