A rock is thrown at a window that is located 18.0 m above the ground. The rock is thrown at an angle of 40.0 above horizontal. The rock is released from a height of 2.00 m above the ground with a speed of 30.0 m/s.
If the rock strikes the window on its upward trajectory, from what horizontal distance from the window was it released? A)
53.2 m
B)
48.7 m
C)
71.6 m
D)
29.8 m
E)
27.3 m
Question 2
A 2.00-kg mass object traveling east at 20.0 m/s collides with a 3.00-kg mass object traveling west at 10.0 m/s.
After the collision, the 2.00-kg mass has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?
A)
0.00 J
B)
458 J
C)
516 J
D)
91.7 J
E)
175 J
Ground cover and colour such as shown here in (a) white sand
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