Physics

Question

help plz im lost

A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?

1 Answer

  • Gravitational potential energy=mass*gravitational acceleration*height
    Kinetic energy = 0.5*mass*velocity²
     So with the given data
    K.E 0.5*1*x²=12.5 v²=12.5÷(0.5*1)
    v=√12.5÷(0.5*1) v=5  
    GPE mass*gravitational acceleration*height
    1*9.81*h=98
    h=98÷(9.81*1)
    h= 9.98 m
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