How much work is done in pulling a box, on the ground, for 20 meters with a force of 20 Newtons making an angle of 10° with the ground?, homework help

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How much work is done in pulling a box, on the ground, for 20 meters with a force of 20 Newtons making an angle of 10° with the ground?

A) 400 J

B) 4000 J

C) 400 tan(10°) J

D) 400 cos(10°) J

A ball is thrown vertically upward with a velocity of 10 m/s. Calculate the maximum height reached by the ball before it returns to the ground. (g = 10 m/s2)

A) 10 m

B) 5 m

C) 100 m

D) 1 m

When a car’s speed changes from 30 m/s to 15 m/s, its kinetic energy

A) is multiplied by 2

B) is divided by 2

C) is divided by 4

D) is multiplied by 4

Please explain how to find answer.

 
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