5. A 50-g ball rolls off a countertop and lands 2 m from the base of the counter. A 100-g ball rolls off the same countertop with the same speed. It lands from the base of the counter.
a) Less than 1 m
b) 1 m
c) 2m
d) 4 m
e) more than 4 m
6. For a given initial speed of an ideal projectile, there is (are) launch angle(s) for which the range of the projectile is the same.
a) Only one
b) Two different
c) More than two but a finite number of
d) Only one if the angle is 45° but otherwise two different
e) An infinite number of
7. A cruise ship moves southward in still water at a speed of 20.0 km/h, while a passenger on the deck of the ship walks toward the east at a speed of 5.0 km/h. The passengers velocity with respect to Earth is
a) 20.6 km/h, at an angle of 14.04° east of south.
b) 20.6 km/h, at an angle of 14.04° south of east.
c) 25.0 km/h, south.
d) 25.0 km/h, east.
e) 20.6 km/h, south.
8.Two cannonballs are shot from different cannons at angles θ01 = 20° and θo2 = 30°, respectively. Assuming ideal projectile motion, the ratio of the launching speeds, v02/v01, for which the two cannonballs achieve the same range is
a) 0.742.
b) 0.862.
c) 1.212.
d) 1.09
e) 2.222.