3. If a missile is launched at 20 up from the horizontal with a speed of 40 m/s, what is its velocity 2 s later? Give the velocity in terms of its direction and speed to 2 signficant figures. Use g = 9.8 m/s. 4. A catapult launches a boulder with an initial speed of 250 m/s at an angle of 45 above the horizontal. What is the speed of the boulder when it reaches its maximum height? Give your answer to 2 significant figures