# Physics PFRD?

A moving object has a kinetic energy of 128 J

and momentum of 23.5 kg·m/s.

a) Find the speed of the object in m/s

b) Find the mass of the object in kg

Update:

A 0.028 kg bullet is fired vertically at 312 m/sinto a 0.18 kg baseball that is initially at rest.How high does the combination rise afterthe collision, assuming the bullet embeds itselfin the ball? The acceleration due to gravity is9.8 m/s2.Answer in units of m.

### 1 Answer

Relevance

- Anonymous8 months agoFavorite Answer
{m*V^2 = 256

{m*V = 23.5

their ratio leads to :

V = 256/23.5 = 10.89 m/sec

...therefore :

m = 23.5/10.89 = 2.157 kg

check :

2.157*10.89 = 23.5 kg*m/sec

2.157*10.89^2/2 = 256 joule

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