Using the Definition of Kinetic Energy, we have:
××

×
50N is your force and the acceleration is -9.8m/s^2 due to gravity.
So, you just plug that in.

BUT you know that mass cannot be negative, so you just disregard the negative sign and the mass of the rock is 5.102 grams.
Answer:
the jet i just took the test
and got 100
Explanation:
Density = Mass/Volume
=> 5g/cm³ = 45kg/Volume
=> 0.005kg/cm³ = 45kg/Volume
=> Volume = (cm³×45kg)/0.005kg
=> Volume = 9000kg/cm³
We need to subtract his current status by his goal:
goal - current = needed
6.12 - 5.73 = 0.39 m.
Now, we need to convert to cm. Since there is 100 cm in 1 m:
0.39 * 100
39 cm
Hope this helps!