Question

Starting from rest, the acceleration of a particle is a = 2(t-1). The velocity of a 2 particle at t = 5 sec is :- A 15 m/s B 18 m/s С 5 m/s D 25 m/s​

Answer 1

Explanation:

Correct option is

A

15m/s

correct answer is A.

a=2(t−1)

=2t−2

dtdv=2t−2

dv=(2t−2)dt

integrating both side we get,

∫dv=∫(2t−2)dt

v=t2−2t+c

=(5)2−2×5

=25−10

=15m/s