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hey guys, i was wondering who is good at science? The reason i am asking is because i got some 6 six questions from college, and i have some clue on how to do them? So here they are:

1. Use the equation of motion to calculate the speed and distance travelled by an object falling from rest under gravity after 3,6 and 9 seconds. Take g=10 meters per seconds squared.

2. A force of 20 N acts for 8 seconds on a mass of 60Kg. What is the (a) acceleration, (b) final speed, (c) average speed, (d) distance covered during the 8 seconds.

3. A force of 20 N is exerted on the handle of a door 0.6 meters from the hinge. If the force acts a right angles to the door, what is the moment it exerts?

4. Calculate the kinetic energy of a car of mass 1200Kg travelling at 25 m/s. If it brakes to rest at 40 meters, calculate the braking force.

5. How much heat is released by the combustion of 4Kg of petrol of calorific value 46 MJ/kg?

6. A sonar beam is radiated from a ship and an echo is received after 0.9 seconds. If the speed of sound in the water is 1400 m/s, how far away is the reflecting surface?

These are the questions i have been given for homework. So guys, please be gentle and if u can, can u also show all clear workings out. Thanks

1. Use the equation of motion to calculate the speed and distance travelled by an object falling from rest under gravity after 3,6 and 9 seconds. Take g=10 meters per seconds squared.

2. A force of 20 N acts for 8 seconds on a mass of 60Kg. What is the (a) acceleration, (b) final speed, (c) average speed, (d) distance covered during the 8 seconds.

3. A force of 20 N is exerted on the handle of a door 0.6 meters from the hinge. If the force acts a right angles to the door, what is the moment it exerts?

4. Calculate the kinetic energy of a car of mass 1200Kg travelling at 25 m/s. If it brakes to rest at 40 meters, calculate the braking force.

5. How much heat is released by the combustion of 4Kg of petrol of calorific value 46 MJ/kg?

6. A sonar beam is radiated from a ship and an echo is received after 0.9 seconds. If the speed of sound in the water is 1400 m/s, how far away is the reflecting surface?

These are the questions i have been given for homework. So guys, please be gentle and if u can, can u also show all clear workings out. Thanks

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