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2019 WAEC Physics Theory A stone of mass 20g is released from a catapult whose rubber is stretched through...

Physics
WAEC 2019

A stone of mass 20g is released from a catapult whose rubber is stretched through 5cm.  If the force constant of the rubber is 200Nm\(^{-1}\), calculate the speed with which the stone leaves the catapult.

 

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Explanation

½Ke\(^{2}\) = ½mv\(^{6}\)

½ x 200 x (0.05)\(^{2}\) = ½ x 0.02 x  v\(^{2}\)

v\(^{2}\) = 25

v = 5 m s\(^{-1}\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995