A truck covers 40.0 m in 8.50 s while smoothly slowing down to a final speed of 2.80 m/s. (a) Find its original speed. (b) Find its acceleration.
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- A roller coastre car rapidly picks up speed as it roles down a slope. As it starts down the slope, its speed is 4 m/s. But 3 seconds later, at the bottom of the slope, its speed is 22 m/s. What is the average acceleration?A 3.20 kg toy rocket is launched from its platform and reaches a height of 253 m after 3.70 s. If the rocket motor only produced an upward acceleration for the first 1.00 s before running out of fuel, what was that initial upward acceleration? Neglect the effect of air resistance.While entering a freeway, a truck accelerates from rest at a rate of 2.1 m/s2 for 11 s. Part (a) How far does the trucktravel in those 11 s, in meters? Part (b) What is the truck's final velocity, in meters per second?
- A spaceship starts at rest, and then launches vertically into the air with an upward acceleration of 2.0 m/s2. When it reaches a height of 500 m, it runs out of fuel; after this point its acceleration is due to gravity, i.e. 9.8 m/s2 downward. (ignore air resistance)(a) How long does it take the spaceship to run out of fuel? (b) What is its velocity at the point when it runs out of fuel? (c) What is the maximum height that the spaceship reaches? (d) For how much time (total, from launch) is the rocket in the air? (e) What is the spaceship’s velocity just before it hits the ground?Abaseball is thrown with an initial velocity of (10i + 15j) m/s. When it reaches the top of its trajectory, what are (a) its velocity and (b) its acceleration? Neglect the effect of air resistance.An object is initially moving at a rate of 14.1 m/s i. What acceleration is required for the object to increase its speed to 26.3 m/s i over a distance of 15.7 m?
- An object is accelerated from rest at a constant rate of 5.00 m/s2. What will be its speed after 8.00 seconds?A certain freely falling object, released from rest, requires 1.40 s to travel the last 22.0 m before it hits the ground. (a) Find the velocity of the object when it is 22.0 m above the ground. (Indicate the direction with the sign of your answer. Let the positive direction be upward.) (b) Find the total distance the object travels during the fall.