A ball of mass 0.5 kg is projected vertically upwards if its velocity at 4m high is 3 m\s find the potential energy and kinetic energy given that the acceleration due to gravity =10 m\s^2?

a ball of mass 0.5 kg is projected vertically upwards if its velocity at 4m high is 3 m\s find the potential energy and kinetic energy given that the acceleration due to gravity =10 m\s^2?

1 Answer
sjc
Apr 23, 2018

#GPE=20J#

#KE=2.25J#

Explanation:

The (gravitational) potential energy is given by the formula

#GPE=mgh#

#m=#the mass

#h=#the height above the reference point

#g=# acceleration due to gravity, in this case it is given as #10ms^(-2)#

#:.GPE=0.5xx10xx4#

#GPE=20J#

Kinetic energy is given by

#KE=1/2mv^2#

#v=#the velocity of the object

we have therefore

#KE=1/2xx0.5xx3^2#

#KE=1/2xx0.5xx9#

#KE=2.25J#

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