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Your help would be greatly appreciated

1. If an object is dropped from a cliff, how many seconds will it take to have a speed of 80m/s?

would gravity be taken into account? This question seems weird because you usually get given 2 variables to get the third, unless I am missing something...

2. What force is required to lift a 20kg weight off the ground?

gravity is 10 (for our exam, 10 is acceptable on earth), 20kg mass. F=ma, but there is no acceleration given, so I don't know what to do

3. A man exerts a 300N upwards force on a 20kg weight that was resting on the ground

a) draw a free body diagram of the forces on the weight

I don't know what a free body diagram is

b) What is the net force on the weight?

I don't know how to calculate net force

Sorry if these sound like easy questions, but this is my first year of studying physics, and I don't get it 100%

1. If an object is dropped from a cliff, how many seconds will it take to have a speed of 80m/s?

would gravity be taken into account? This question seems weird because you usually get given 2 variables to get the third, unless I am missing something...

2. What force is required to lift a 20kg weight off the ground?

gravity is 10 (for our exam, 10 is acceptable on earth), 20kg mass. F=ma, but there is no acceleration given, so I don't know what to do

3. A man exerts a 300N upwards force on a 20kg weight that was resting on the ground

a) draw a free body diagram of the forces on the weight

I don't know what a free body diagram is

b) What is the net force on the weight?

I don't know how to calculate net force

Sorry if these sound like easy questions, but this is my first year of studying physics, and I don't get it 100%

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