Question

A body starts moving with an initial velocity of u m s–1 and an acceleration of 4 m s–2. If the distance travelled by it is 20 m in the 2 second, then the
value of u is ___________.

a) 41 m/s
b) 14 m/s
c) 5 m/s
d) 10 m/s​​

Answer 1

Answer:

Given

Acceleration of the body, a = 4 m/s²

Distance travelled by the body, s = 20 m/s

Time taken by the body, t = 2 seconds

To Find

Initial velocity, u = ?

Formula to be used, 2nd equation of motion, s = ut + 1/2 x at²

Solution

Putting all the values, we get sut + 1/2 x at²

20 = u× 2 + 1/2 x 4 x (2) 2

20 = 2u + 2 × 4

20 = 2u +8

20 - 8 = 2u

12 = 2u

12/2 = u

u = 6 m / s

Answer 2

answer in the attachment..hope it helps you