Anet force of 2.5x10^3 north acts on an object for 5.0 s. during this time an object accelerates from rest to a velocity of 48km/h. what is the mass of the object?

Given information:

Convert the units of velocity into something more useful for this problem:

We know . Solving for mass gives

Now use a kinematic equation to find acceleration in terms of known information.

Plug in and solve.

This gives us a mass of 937.5 kg.

However, the least amount of significant figures we had was 2, so with correct significant figures, this would be 940 kg.

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.

compass can be used day and night, cloudy or sunny