Answer:
Explanation:
masie m = 20g = 20/1000 = 0.02kg
prędkość v = 50m/s
P.E = K.E = ½mv²
P.E = ½ × 0.02 × 50²
P.E = 25 J
pracę wykonana = P.E = 25J
Answer:
The initial velocity of the cart was 0.91m/s.
Explanation:
When the car comes to a stop it has delivered all of its kinetic energy to the spring; therefore,

solving for
we get:

we put in
,
, and
to get:

