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.