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# Dynamics of the particles moving in a straight line watch

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1. A small stone of mass 400g is projected vertically upwards from the bottom of the pond with speed 10m/s. As the stone moves through the water it experiences a constant resistance of magnitude 3N. Assuming that the stone does not reach the surface of the pond, find
a) the greatest height above the bottom of the pond that the stone reaches,
b) the speed of the stone as it hits the bottom of the pond on its return,
c) the total time taken for the stone return to its initial position on the bottom of the pond.
2. (Original post by azhar1932391)
A small stone of mass 400g is projected vertically upwards from the bottom of the pond with speed 10m/s. As the stone moves through the water it experiences a constant resistance of magnitude 3N. Assuming that the stone does not reach the surface of the pond, find
a) the greatest height above the bottom of the pond that the stone reaches,
b) the speed of the stone as it hits the bottom of the pond on its return,
c) the total time taken for the stone return to its initial position on the bottom of the pond.
Use Newton's Second Law to find the acceleration of the stone through the water. It will be constant as the force is constant.

Then use your standard SUVAT equations

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Updated: February 2, 2017
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