which (choosing the positive root) leads to ′ =++′dmgm gmkvki222which yields d´ = 0.23 m. In order to obtain this result, we have used more digits in our intermediate results than are shown above (so 12.048 m/s3.471 m/siv==and 'iv= 6.942 m/s). 54. (a) The compression of the spring is d= 0.12 m. The work done by the force of gravity (acting on the block) is, by Eq. 7-12, Wmgd1025029=(..kg) 9.8 m / s (0.12 m)J.2ch(b) The work done by the spring is, by Eq. 7-26, Wkd22121225018=−N / m) (0.12 m)J.
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This note was uploaded on 03/19/2010 for the course PHYSICS 191262 taught by Professor Najafzadeh during the Spring '09 term at The Petroleum Institute.