1. A student of mass 50kg climbs the college stairs using 2500J of energy, calculate the height of the stairs.
1. An astronaut of mass 70 kg climbs to a height of 5 m on the moon and gains 560 J of gravitational potential energy. What must be the gravitational field strength on the moon?
1. What is the speed of a stone of mass 2 kg if it has 36 J of kinetic energy?
1)
"h=\\frac{E}{mg}=5~m,"
2)
"g=\\frac{E}{mh}=1.6~\\frac{N}{kg},"
3)
"v=\\sqrt{\\frac{2E}{m}}=6~\\frac ms."
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