Question

While playing at the swimming pool, a 40-kilogram boy jumps off the side of the pool. When he hits the water, he is traveling 3 m/s. How much kinetic energy does he have right before he hits the water?

180 J

120 J

60 J

40 J

Answer 1

Kinetic energy= 1/2mv^2
m=40kg
v= 3m/s
K.E.=1/2 (40)(3)^2
K.E.=20× 9
K.E.=180 J

Answer 2

K.E. = mv² / 2
Here, m = 40 Kg
v = 3 m/s

Substitute their values,
K.E. = 40 * (3)² / 2
K.E. = 40 * 9 / 2
K.E. = 360/2
K.E. = 180 J

In short, Your Answer would be Option A

Hope this helps!