Question

The velocity of a body moving at an initial speed of 20 m/s and having an acceleration of
4 m/s after 2 s will be​

Answer 1

Answer:

Initial speed, u=20m/s

Final speed, v =?

Acceleration, a = 4m/s2

And, Time, t = 2s

Now, v = u + at

So, V = 20 + 4 x 2V = 20 + 8

V = 28m/s

Thus, after two seconds, the speed will be 28m/s.

Answer 2

Answer:

Initial speed of the body = 20 m/s.

Acceleration = 4 m/s.

Time = 2 s.

Using the first equation of motion :

⇒ v = u + at

⇒ v = 20 + 4*2

⇒ v = 20 + 8

⇒ v = 28 m/s

Hence, the velocity of the body after 2 s will be 28 m/s.

Important Formulas :

• v = u + at
• v² - u² = 2as
• s = ut + ½at²
• a = dv/dt
• v = ds/dt
• a = (dv/ds)v
• ∆x = x2 - x1