Question

A motor boat starting with u= 9ms on a lake accelerates in a straight line at a constant rate of -3ms find the distance covered by the boat in 8s​

Answer 1

Answer:

8 m.

Explanation:

$Given \ u=9m/sec\\\\\\a=-3m/sec^{-2}\\\\\\time=8sec\\\\\\we \ have \ to \ find \ distance(s)\\\\\\From \ second \ equation \ of \ motion \ we \ have\\\\\\s=ut+\dfrac{1}{2}at^2\\\\\\ where \ u=initial \ velocity\\\\\\a=acceration\\\\\\t=time\\\\\\putting \ given \ values \ here\\\\\\s=9\times8+\dfrac{1}{2}\times-2\times8\times8\\\\\\s=72-64 \ m\\\\\\s=8 \ m\\\\\\Thus \ distance \ covered \ by \ the \ boat \ is \ 8 \ m.$