[tex]_{}[/tex](adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

If a long jumper at the top of his projectory is moving at 6.5 m/s (horizontally) and his cantre of mass is 1.1m above where it was when he launched into the jump, how fast must he have been moving when he launched?

2. Relevant equations

v[tex]_{x}[/tex] = v[tex]_{0x}[/tex] + a[tex]_{x}[/tex]t

x = [tex]\frac{1}{2}[/tex] (v[tex]_{0x}[/tex] + v[tex]_{x}[/tex])t

x = v[tex]_{0x}[/tex]t + [tex]\frac{1}{2}[/tex]a[tex]_{x}[/tex]t[tex]^{2}[/tex]

v[tex]_{x}[/tex][tex]^{2}[/tex] = v[tex]_{0x}[/tex][tex]^{2}[/tex] + 2a[tex]_{x}[/tex]x

3. The attempt at a solution

v[tex]_{x}[/tex] = 6.5 m/s

y = 1.1m

y[tex]_{0}[/tex] = 0m

while the jumper is at the top of trajectory [tex]\rightarrow[/tex] v[tex]_{y}[/tex] = 0m/s

is it possible to work out this question with just those equations?

they all have either a time, acceleration of x component (i.e. distance travelled)

also is this considered a projectile motion problem as he was running before he jumped.

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# Homework Help: Another motion prob

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