camzelMayana
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1. The olympic record for the marathon is 2.00 h, 9.00 min., 21.0 s,. if the average speed of a runner acheiving this record is 5.436 m/s, what is the marathon distance?
a) 15,878 km
b) 7,761 km
c) 42.2 km
d) 26.2 km
2. A child is pushing a shopping cart at the speed of 1.5 m/s. how long will it take this child to push this cart down an aisle with a length of 9.3 m?
a)1.6 s
b)13.9 s
c)62 s
d)6.2 s

Respuesta :

1) total seconds= 2hrs+9mins+21secs= 7200+540+21=7761 
2)multiply time by speed
7761secs x 5.436m/s = 42188m =42.2km (1dp) 
hope this helps
HomertheGenius
1.   t = 2 h 9 min 21 s = 7.761 s
v = 5.436 m/s
d = v * t = 5.436 m/s * 7,761 s = 42,188.8 m ≈ 42.2 km
Answer: C ) 42.2 km
2.  v = 1.5 m/s;  d = 9.3 m
t = d/ v = 9.3 m / 1.5 m/s = 6.2 s
Answer: D ) 6.2 s 

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