If you want to lift a 5-kg box to a height of 2 meters, how much work must be done?
A. 100 J
B. 98 J
C. 50 J
D. 2 J

Answer

Multiply weight by height by Gravitational force   5kgₓ2metersₓ9.81m/s∧2=98.1joules

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.