Astudent weighs 400 newtons climbs a 3 meter ladder in 4 seconds how much work is the student do

i believe it is b. what was the cause of the big bang

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b.

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when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.