Mathematics, 26.06.2020 16:01, Izzyfizzy

The energy E possessed by an object of mass m kg travelling at a height h m with a velocity v m/s is given by $E = \frac{mv { }^{2} }{2} + mgh \: joules$
a) Express v in terms of the other letters.
b) If the energy of a 20 kg mass at a height of 15m is 4 900 joules and g = 9.8, how fast is the mass moving?
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The energy E possessed by an object of mass m kg travelling at a height h m with a velocity v m/s is...