Calculate the change in momentum of a 0.140 kg baseball that starts at rest and is struck by a bat with a contact time of 0.32 seconds for 100 N.

32kgm/s

Explanation:

Given that,

impulse I = ?

Mass of baseball M = 0.140 kg

force F = 100 N

Time = 0.32 seconds

Recall that impulse of an object is the product of force and the time during which it acts, and impulse is also equal to change in momentum.

i.e Impulse = Force x Time

Also, Change in momentum = Force x Time

So, I = Ft = m(Vf - Vi)

hence, Change in momentum = Ft

Momentum = 100N x 0.32 seconds

Momentum = 32kgm/s

Thus, the change in momentum of the baseball is 32kgm/s

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.

the force on the thing and the distance the force moves the thing