A projectile is shot straight upward from the Earth with a speed of 20  m / s. Using energy considerations, how high is the projectile when its speed is 8.0  m / s ? Ignore air friction. Because the projectile's energy is conserved, Change in KE change in PEG=0 (1)/(2) m vf^2-(1)/(2) m vi^2 (m g)(hf-hi)=0 We wish to find hf-hi. After a little algebra, hf-hi=-(vf^2-vi^2)/(2 g)=-((8.0  m / s)^2-(20  m / s)^2)/(2(9.81  m / s)^2)=17  m | Numerade
A projectile is shot straight upward from the Earth with a speed of 20  m / s. Using energy considerations, how high is the projectile when its speed is 8.0  m / s ? Ignore air friction. Because the projectile's energy is conserved, Change in KE change in PEG=0 (1)/(2) m vf^2-(1)/(2) m vi^2 (m g)(hf-hi)=0 We wish to find hf-hi. After a little algebra, hf-hi=-(vf^2-vi^2)/(2 g)=-((8.0  m / s)^2-(20  m / s)^2)/(2(9.81  m / s)^2)=17  m | Numerade
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