# An object has a mass of #6 kg#. The object's kinetic energy uniformly changes from #120 KJ# to # 72 KJ# over #t in [0, 4 s]#. What is the average speed of the object?

Average speed is

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The average speed of the object is 10 m/s.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

- An object travels North at # 8 m/s# for #9 s# and then travels South at # 5 m/s# for # 2 s#. What are the object's average speed and velocity?
- An object's two dimensional velocity is given by #v(t) = ( 3t^2 - 5t , -t^3 +4t )#. What is the object's rate and direction of acceleration at #t=1 #?
- A projectile is shot from the ground at a velocity of #24 m/s# at an angle of #(5pi)/12#. How long will it take for the projectile to land?
- What is the final velocity of a body that accelerates at #"150 m/s"^2"# for #"2 s"# from a velocity of #"75 m/s"#?
- An object travels North at # 5 m/s# for #2 s# and then travels South at # 1 m/s# for # 2 s#. What are the object's average speed and velocity?

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