A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground. The magnitude of the vertical impulse the catapult receives from the rock is
a. 5.1 × 10^4 N s.
b. 6.1 × 10^4 N s.
c. 8.0 × 10^4 N s.
d. 5.0 × 10^5 N s.
e. 6.0 × 10^5 N s.
a
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