What do you mean by a kettle is 2000W?

Minimum force to lift a drum over a step (different examples)

Given that the mass of the drum is 20 kg. What is the minimum force, F, required to just movee th drum off the ground? (Assume uniform mass of drum and g = 10 N/kg)

Knowing the position of the pivot and identifying the perpendicular distance is important. Consider the 3 variations of the same question as shown below.

Type 1: Very straight forward as the pivot is same level as the CG of the drum. Hence pendicular distance is easy to identify.

Type 2: Using pythagoras theorem to find the necessary perpendicular distance.

Type 3: Using Toa, Cah and Soh to find the necessary perpendicular distance.

Ball thrown vertically up from building and falls to ground

A rock is thrown vertically upwards with a velocity of 29.4 m/s from the top of a building 78.4 m high. After how long will the rock reach the ground below? (Take g = 10 m/s2)

Many are familiar with calculation when ball is released from rest. This question involves ball being thrown upwards, and then it falls to the ground. To solve this question, just treat the motion as 2 separate parts.

1) Ball going up to max height,

2) Ball going down (similar to ball released from rest from highest point)