Question

The velocity of a body starting from rest and moves with uniform acceleration is 20 m/s in the 4th second and 40 m/s in the 8th second. Calculate the acceleration of the body. ​

Answer 1

this is correct answer I think so

Answer 2

Answer:

Velocity at the 4th second u = 20m/s

Velocity at the 8th second v = 40m/s

$acceleration \: = \: \frac{v - u}{t} \: = \frac{40 - 20}{4} = \frac{20}{4} \: = \: 5ms {}^{2}$

Distance travelled s = ut + ½ at²

= 20 × 4 + ½ × 5 × 4²

= 80 + 40 = 120m