1. A child's toy uses a spring to launch a 135 g-ball vertically upwards with a time-varying force which starts at t=0 s and lasts 0.25 s. The force is given by F(t)=10N (1-t/0.25s) and is directed straight up. Air drag can be ignored in this problem. A. What is the velocity of the ball after the 0.25 s passes and the ball leaves the launcher? Hint: you need to take gravity into consideration for this problem. B. After the ball leaves the launcher, how high does it get in the air?

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