As planets move toward the sun, they tend to: a. move at constant speed b. speed up c. burn up d. slow down

B. speed up

Explanation:

The acceleration of an object due to a body's gravity is:

g = GM / r²

where G is the universal constant of gravitation,

M is the mass of the body,

and r is the distance from the body.

As a planet approaches the sun, r decreases.  As r decreases, g increases.

a, c, d, e are all applying about success strategies.

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