Answer to Question #107658 in Mechanics | Relativity for artem

Question #107658
A 0.5 kg water balloon is dropped from a balcony 40 meters from the ground. What is the balloon's velocity just as it hits the ground? (Ignoring air resistance)
1
Expert's answer
2020-04-03T13:24:06-0400

Ignoring the air resistance means the case of free fall (gravity is the only force acting upon body).

h=v0t+gt22h=v_0 t+\frac{gt^2}{2}

and

v=v0+gtv=v_0+gt,

where hh - height, m; vv - velocity, m/s; v0v_0 - initial velocity, m/s; tt - time, s; gg - acceleration due to gravity, m/s2 (g9.8  m/s2g \approx 9.8 \; m/s^2). In our case v0=0v_0 =0, so balloon will hit the ground at

t=2hgt= \sqrt{\frac{2h}{g}}

v=g2hg=2ghv=g \cdot \sqrt{\frac{2h}{g}} = \sqrt{2gh}

v=29.840=784=28  m/sv=\sqrt{2 \cdot 9.8 \cdot 40} = \sqrt{784} = 28 \; m/s


Answer: 28 m/s.


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment