A projectile is shot from the edge of a cliff 125 m above the ground level with an initial speedof 65.0 m/s at an angle of 37.0º with the horizontal. The time taken by the projectile to hit theground is 10.4 s.8. The maximum height of the of the projectile above the ground level isA) 203 mB) 78 mC) 137 mD) 262 mE) 216 m
Question
A projectile is shot from the edge of a cliff 125 m above the ground level with an initial speedof 65.0 m/s at an angle of 37.0º with the horizontal. The time taken by the projectile to hit theground is 10.4 s.8. The maximum height of the of the projectile above the ground level isA) 203 mB) 78 mC) 137 mD) 262 mE) 216 m
Solution
Para resolver este problema, primero descompondremos la velocidad inicial en sus componentes horizontal y vertical.
-
Descomposición de la velocidad inicial:
- Velocidad inicial () = 65.0 m/s
- Ángulo () = 37.0º
Componentes de la velocidad inicial:
Usando las funciones trigonométricas:
Entonces:
-
Altura máxima alcanzada por el proyectil: La altura máxima se alcanza cuando la velocidad vertical () es 0. Usamos la fórmula de la cinemática: Donde:
- (en el punto más alto)
- (aceleración debida a la gravedad)
- es el tiempo para alcanzar la altura máxima.
Resolviendo para :
Ahora, usamos la fórmula de la altura para encontrar la altura máxima alcanzada desde el punto de lanzamiento:
-
Altura máxima sobre el nivel del suelo: La altura máxima sobre el nivel del suelo es la suma de la altura del acantilado y la altura máxima alcanzada desde el punto de lanzamiento:
Por lo tanto, la altura máxima del proyectil sobre el nivel del suelo es aproximadamente 203 m.
La respuesta correcta es: A) 203 m
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