Una bicicleta que circula a 18km/h y se detiene en 0.8 segundos. Calcular la aceleración.
1 answer:
The acceleration is .
Explanation:
The acceleration of an object is given by:
where
v is the final velocity
u is the initial velocity
t is the time taken for the velocity to change from u to v
For the bike in this problem, we have:
is the initial velocity
v = 0 is the final velocity (the bike comes to a stop)
t = 0.8 s is the time interval
Substituting, we find the acceleration:
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Answer:
Explanation:
Use the one-dimensional equation:
which says that the final velocity of a falling object is equal to its initial velocity times the acceleration of gravity times the time it takes to fall. We have the final velocity, -14.5 (negative because its direction is down and down is negative), initial velocity is 0 (because it was held still by someone before it was dropped), and acceleration is -9.8 (negative again, because direction is down while acceleration increases). Filling in:
-14.5 = 0 - 9.8t and
-14.5 = -9.8t so
t = 1.5 seconds