Question #30ae8

1 Answer
Nov 11, 2016

Answer:

The distance is #=625 m#

Explanation:

Let's convert the #kmh^(-1)# in #ms^(-1)#

#90kmh^(-1)=90*1000/3600=900/36=25 ms^(-1) #

We use the equation,

#v^2=u^2+2as#
where #v=#final velocity (#0#)
#u=# initial velocity (#25ms^(-1)#)
#a=# acceleration (#-0.5ms^(-2)#)
#s=# distance #=?#

So, #0=25^2+(2*-0.5*s)#

#s=25^2=625 m#