Question

A particle starts with a velocity of 2m/s and moves in a straight line with a retardation of

0.1m/s2

. Find the time at which particle is 15 m from the starting point.

Answer 1

Explanation:

u= 2m/s

a= -0.1m/s²

s=18m

v=?

then,

v²-u²=2as

v²=2as+u²

v²=2*(-0.1)*15+2²

v²=-3+4

v=1m/s

and time is

v=u+at

t=v-u/a

t=1-2/(-0.1)

t=10second

Answer 2

T = 10 seconds

Hope it helps