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Projectile motion sand bag drop

  1. Apr 24, 2015 #1
    sand bag is dropped...i can understand that vertical acceleration is 9.8m/s^2...so vertical velocity increases in a.p (9.8, 19.6..... m/s)...but this book says horizontal velocity of sandbag is constant and same as that of hot-air balloon (i.e., 12m/s)...I think the horizontal velocity should decrease gradually...but it doesn't...why?

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  2. jcsd
  3. Apr 24, 2015 #2


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    The book is ignoring air resistance. Can you see that in the absence of air resistance, horizontal velocity must be constant?
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