45m :3 km and 75cm to 7m
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Q1. Does work have a direction?
Q2. A body of mass 25 g has a momentum of 0.40 kgm/s.Find its kinetic energy.
Q3. A body of mass 3.0kg and a body B of mass 10 kg are dropped simultaneously from a height of 9m. Calculate their Momenta, their Potential energies and kinetic energies when they are 10m above the ground.
Q4. A light and heavy body have equal momenta. Which one has greater kinetic energy?
Q5. Why does a person standing for a long time get tired when he does not appear to do any work?
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Can anyone please help me???
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Answer:
3 km = 3000m
but 75 cm = 7.5m
so= 3000+7.5=
3007.5 m ...
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