When landing after a spectacular somersault, a 41 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert if her deceleration is 7.00 times the acceleration due to gravity. Explicitly show how you follow the steps in the Problem-Solving Strategy for Newton's laws of motion.

The force the  gymnast  must exert is 2812.6 N.

Explanation:

Given;

mass of the gymnast, m = 41 kg

her deceleration, -a = 7g = 7 x 9.8m/s² = 68.6 m/s²

Apply Newton's second law of motion;

F = ma

where;

F is the magnitude of the force exerted

m is the mass of the gymnast

a is the deceleration

Substitute in the given values of m and a into the force equation;

F = ma

F = 41 x 68.6

F = 2812.6 N

Therefore, the force the  gymnast  must exert is 2812.6 N.

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.