Susan and hannah are each riding a swing. susan has a mass of 25 kilograms, and hannah has a mass of 30 kilograms. susan’s swing moves with a velocity of 10 meters/second, while hannah’s swing moves with a velocity of 8.5 meters/second. susan’s kinetic energy is (1080,1250,1350, or 1500) joules. susan’s kinetic energy is greater than hannah’s because: speed has a greater effect than mass, mass has a greater effect than speed, mass and speed have the same effect, or mass and speed dont have any effect?

Kinetic energy is given by:

K.E. = 0.5 m v²

Susan has mass, m = 25 kg

Velocity with which Susan moves is, v = 10 m/s

Hannah has mass, m' = 30 kg

Velocity with which Hannah moves is, v' = 8.5 m/s

Kinetic energy of Susan:

0.5 m v² = 0.5 × 25 kg × (10 m/s)² = 1250 J

Kinetic energy of Hannah:

0.5 m v'² = 0.5 × 30 kg × (8.5 m/s)² = 1083.75 J

Susan's kinetic energy is 1250 J and Hannah's kinetic energy is 1083.75 J.

Since kinetic energy is dependent on mass and square of speed. Thus, speed has a greater effect than mass. As it is evident from the above example. Susan has greater kinetic energy due to higher speed than Hannah.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it