The boulder has a weight of W=2400 N. The weight of an object is the product between its mass m and the gravitational acceleration g:

Rearranging the relationship, we can calculate the mass of the boulder:

We are told that Superman applies a horizontal force to this object, and as a result, the acceleration of the boulder is

. We can find the force applied by using Netwon's second law of motion:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. As the source of sound waves approaches a listener, the sound waves get closer together, increasing their frequency and the pitch of the sound.
I’m hope this help
Answer:
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Explanation:
-- She went up for 0.4 sec and down for 0.4 sec.
-- The vertical distance traveled in gravity during ' t ' seconds is
D = (1/2) x (g) x (t)²
= (1/2) (9.8 m/s²) (0.4 sec)²
= (4.9 m/s²) x (0.16 s²)
= 0.784 meter ( B )
Ability to maintain ones balance when not moving.