Question #a85ff

1 Answer
Massimiliano
Jun 10, 2015

#Deltas=25m#.

Explanation:

The law is:

#s=s_0+v_0t+1/2at^2#,

so:

#s_5=0+7*5+1/2*4*5^2=85m# is the position at the end of the 5th second,

#s_4=0+7*4+1/2*4*4^2=60m# is the position at the end of the 4th second,

so the distence run in the 5th second is #Deltas=85m-60m=25m#.

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