Question

an object moving north with an initial velocity of 60 m/s brought to rest after a distance of 120 m. assume acceleration is uniform calculate retardation and time interval

Answer 1

u =60 m/s

s=120m

v=0 m/s

t=?

acceleration=?

v²=u²+2as

0²=60²+2*a*120

0=3600+240a

a=-3600/240=-30m/s²

v=u+at

0=60+(-30t)

-30t=-60

t=-60/-30=2sec