Question

An object starts from rest and moves under the acceleration a = 4î. Its position after 3s is = 7î+4j

What was its initial position?
(1) -1 11 + 4 ] (2 111 - 4 ] (3) û + 14 ] (4 71 - 147
A
-1​

Answer 1

Answer:

Since,the body starts from rest.

Fhus, has zero velocity at beginning.

Explanation:

And, since its acceleration is only in x-axis. Thus, at every moment body is at 4j along y axis.

And, at x axis, s=ut+0.5at^2

u=0

s=0.5*4*9=18units travel only al

ong x axis.

Thus, initial at x-axis = 7-18=-11

Thus, initial position is -11î+4j.

answer will be (a).

please mark it as brainliest answer.......