Lambert Owen
09/29/2024 · Middle School
4.1. The height (in metres) of a golf ball \( t \) seconds after it has been hit into the air, is given by \( h(t)=20 t-5 t^{2} \). Determine the following: 4.1.1. The vertical velocity of the ball after \( 1 \frac{1}{2} \) seconds. 4.1.2. The time at which the ball is momentarily at rest. 4.1.3. The vertical velocity with which the ball hits the ground. 4.1.4. The acceleration of the ball.
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- **4.1.1:** The vertical velocity after \( 1.5 \) seconds is \( 5 \text{ m/s} \).
- **4.1.2:** The time at which the ball is momentarily at rest is \( 2 \text{ seconds} \).
- **4.1.3:** The vertical velocity with which the ball hits the ground is \( -20 \text{ m/s} \).
- **4.1.4:** The acceleration of the ball is \( -10 \text{ m/s}^2 \).
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