Please help. A weight is pulled up with a spring such that the spring force is equal to 35N and the weight accelerates upwards at 3m/s^2 solve for the mass of the weight

Force = mass × acceleration

Now, keeping this formula in mind you can find the mass as follows;

= 35 = m × 3

= 35/3 = m

= 11.6 kg = m

And yeah its done!:)

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

a and b sometimes have a positive value