A boy of mass 50kg runs up a set of stress of total height 3.0m. Find the work done against gravity
W=mg*h=50*10*3=1500joules
I do not know the answer please tell me how they solved the problem and how they got the answer
To find the work done against gravity, we can use the formula:
Work = force × distance
In this case, the force required to work against gravity is equal to the weight of the boy. The weight of an object can be calculated using the formula:
Weight = mass × acceleration due to gravity
In this example, the mass of the boy is given as 50 kg. The acceleration due to gravity is approximately 9.8 m/s².
Weight = 50 kg × 9.8 m/s²
Weight = 490 N
Now that we know the weight of the boy, we can calculate the work done against gravity. The distance is given as 3.0 m.
Work = force × distance
Work = 490 N × 3.0 m
Work = 1470 Joules
Therefore, the work done against gravity is 1470 Joules.