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Answer: We know from question that
initial velocity is 25.0 m/s
final velocity is 0 m/s (it is at rest)
By using this formula we can find acceleration:
aav = v/t
a= (25 m/s) / (5 sec)
a= – 5 m/s/s, because it is slowing down
we can use the formula: v2 = u2 + 2as,
(0 m/s)2= (25 m/s)2 + 2(-5 m/s/s) s
0= 625 + (-10) s
-625= (-10) s
s= 62.5 mAnswer: Ar
Argon is classified as the element in the ‘Noble Gases’. This comes under the group 18 of the Periodic Table.Given v=65 mph
S=130 miles
we have v = s/t
t = s/v
= 130 / 65 = 2 hrs
T= 2 hour (1)2nd case,
S= 55 mph
T= (3.33-2)
= 1.33 hour
v = s/t
Distance covered =55 *1.33= 73.33 miles (2)
From (1) and (2)
Total distance 73.33+130 = 203.33 miles(b)Average speed = (total distance )/(total time)
=(203.33 )/3.33
=61.06 mph
