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Which has more momentum, a #4kg# object moving at #4m/s# or a #5kg# object moving at #9m/s#?

Answer 1

William Audy

Second object.

The equation gives momentum.

#p=mv#

#m# is the mass of the object in kilograms

#v# is the velocity of the object in meters per second

We obtained:

#p_1=m_1v_1#

Change to the specified values,

#p_1=4 \ "kg"*4 \ "m/s"#

#=16 \ "m/s"#

Next,

#p_2=m_2v_2#

Same thing, replace with the specified values,

#p_2=5 \ "kg"*9 \ "m/s"#

#=45 \ "m/s"#

We see that #p_2>p_1#, and so the second object has more momentum than the first object.

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Answer 2

Axel Acevedo

To calculate momentum, use the formula: momentum = mass × velocity.

For the first object: momentum = 4 kg × 4 m/s = 16 kgm/s. For the second object: momentum = 5 kg × 9 m/s = 45 kgm/s.

The 5kg object moving at 9m/s has more momentum.

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Answer from HIX Tutor

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.