A 0.5 kg brick is dropped from a height of 6.0 m. It hits the ground and comes to rest. (a) What is the magnitude of the impulse exerted by the ground on the brick? N·s (b) If it takes 0.0013 s from the time the brick first touches the ground until it comes to rest, what is the magnitude of the average force exerted by the ground on the brick?

a). Impulse = 32.373 Ns

b). Force = 2490 N

Explanation:

Impulse = force * time

Force = Mgh

But time is unknown.

From

V² = U² + 2as

But V = at

(at)²= 0² + 2as

But a = 9.81. ( Acceleration of free fall)

t² =( 2*9.81*6)/96.2361

t = 1.1 sec

Force = Mgh

Force = 0.5*6*9.81

Force = 29.43 N

Impulse = 29.43*1.1

Impulse = 32.373 Ns

But if it takes 0.013 sec ...

Force = 32.373/0.013

Force = 2490 N

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

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