before striking a vertical spring, which it compresses an amount Y. The spring constant of the spring is k-2 N/m. Take g=10 m/s. m 3. The speed of the ball just before it strikes the spring is: (a) 1 m/s (b) 5 m/s (c) 10 m/s 4. The ball compresses the spring the amount Y=: (a) 5 m (b) 5-3 m (c) 5(1+3) m (d) 20 m/s (d) 5(1-3) m