Un proyectil tiene una velocidad horizontal inicial de 40 m/s en el borde de un tejado. Encuentre las componentes horizontal y vertical de su velocidad después de 3 s.

Explanation:

The horizontal velocity of the object is expressed as:

Ux = vt

v is the velocity = 40m/s

t is the time = 3s

Ux =40×3

Ux = 120m/s

The vertical component Is expressed as;

Uy = gt²/2

Uy = 9.8(3)²/2

Uy = 9.8×9/2

Uy = 9.8×4.5

Uy = 44.1m/s

The vertical component of the velocity is 44.1m/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.