Hossein is a weightlifter. His best lift in training is a bar with a mass of 250kg. He does 5000 j of work on the bar with a mass of 250kg when he lifts it. The gravitational field strength (g) on earth is 10 N/kg

I am trying to calculate the weight of this 250kg mass, and how high Hossein lifts the bar.

Weight = 2,500N (I think) but can’t work out how to get the height lifted in metres..

Can anyone help in working this out, showing workings so I can work it through with my daughter.

Many thanks

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

does anyone know or what?

not too sure thinking all accelerations are pointed down