4. Calculate the power used by a 40 kg man if he climbs a 6 m tall ladder in 15 seconds.

To calculate the power used, we need to determine the work done and then divide it by the time taken.First, let's calculate the work done. Work is given by the formula: The force here is the weight of the man, which can be calculated using: Now, the distance climbed is 6 meters. So, the work done is: Next, we calculate the power used. Power is given by the formula: Therefore, the power used by the man is .