1. At t=0, a hovercraft is stationary and accelerating at a uniform rate of 0.8 m/s^(-1) east. What is the velocity of the hovercraft and its displacement with respect to its initial position at t=20s?
2. A blue car traveling at 80 km/h^(-1) west is passed by a red car traveling in the same direction at 100 km/h^(-1).
- What is the velocity of the red car relative to the blue car?
- What is the velocity of the blue car relative to the red car?
A green car then passes the blue car. The velocity of the green car relative to the blue car is 6 km/h^(-1) west.
- What is the velocity of the green car?
- What is the velocity of the green car relative to the red car?
3. You throw a ball straight up. The speed of the ball just after it leaves your hand is 14.1 m/s^(-1) upwards. The ball rises, reaches its maximum height, then falls down. You can catch the ball when it is the same height that you let it go.
- What is the acceleration of the ball just after you let it go?
- What is the acceleration of the ball when it is at its maximum height?
- What is the acceleration of the ball just before you catch it?
- How long does it take the ball to reach its maximum height?
- How long is the ball in the air before you can catch it?
- What is the velocity of the ball at the instant when it is at its maximum height?
- What is the velocity of the ball at the instant just before you catch it?