Question

A backpack has a mass of 8 kg. it is lifted and given 54.9 J of gravitational potential energy. how high is it lifted? Acceleration due to gravity is g = 9.8 m/s^2. A) 3.2 m B) 0.15 m C) 6.9 m D) 0.7 m

Answer 1

0.7 m

Option D is the correct option.

solution,

Potential Energy(PE)=54.9 J

Mass(m)=8 kg

Acceleration due to gravity (g)=9.8 m/s^2

Height (h)=?

Now,

`p.e = m * g * h \\ or \: 54.9 = 8 * 9.8 * h \\ or \: 54.9 = 78.4 * h \\ or \: h = (54 .9)/(78.4) \\ h = 0.7 \: m`

Hope this helps...

Good luck on your assignment..