A ball with a mass of #160 g# is projected vertically by a spring loaded contraption. The spring in the contraption has a spring constant of #45 (kg)/s^2# and was compressed by #1/4 m# when the ball was released. How high will the ball go?

1 Answer
Aug 12, 2017

Answer:

The height is #=0.9m#

Explanation:

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The spring constant is #k=45kgs^-2#

The compression is #x=1/4m#

The potential energy in the spring is

#PE=1/2*45*(1/4)^2=1.41J#

This potential energy will be converted to kinetic energy when the spring is released and to potential energy of the ball

#KE_(ball)=1/2m u^2#

Let the height of the ball be #=h #

Then ,

The potential energy of the ball is #PE_(ball)=mgh#

#PE_(ball)=1.41=0.160*9.8*h#

#h=1.41*1/(0.160*9.8)#

#=0.9m#