Write a difference between temperature and thermal energy?

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.