Answers

2014-05-25T15:20:11+05:30
Speed=totaldistance /totaltime

per hour=60 min

so for 4 sec it traveled 16m=16/4=4m per hour

for 2sec it travelled 16m=16/2=8min per hour

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2014-05-25T15:21:29+05:30
≡formula for finding speed///⌠S=D/T⌡
s-speed
D-distance covered  
T-time take to travel
where the object travels 16m in 4s /where the speed is 16/4 = 4 m/s= 14.4km/s
where the another object gravels 16m in 2s /where the speed is  16/2 = 8m/s=28.8km/s
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