A body moving along a straight line at 20 m/s decelerates at the rate of 4 m/s2. After 2 seconds its speed will be equal to 12 m/s 8 m/s 16 m/s 12 m/s
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- The instantaneous acceleration at time t = 1 s is m/s2.The instantaneous acceleration at time t = 3 s is m/s2.The instantaneous acceleration at time t = 5 s is m/s2.A long jumper leaves the ground at an angle of 29 degrees and lands 8.2 meters away. With what speed did he jump? Please answer in m/sA hot-air balloon is ascending at the rate of 13 m/s and is 87 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?
- True or false: If an object accelerates from rest covering 2.0m in 1.0s in the forwards direction then, even though its average velocity is 2.0m/s its instantaneous velocity (or vf in your equations) will be 4.0m/s at t=1.0s and its initial velocity (vi in your equations) will be 0.0m/s at t=0After 5.2 seconds of uniform acceleration from rest, a spacecraft reaches an altitude of 5.7 x 10² meters upwards. What is the final velocity of the Spacecraft?The x component of the velocity of an object moving along the x axis is given as vy = 4t – 3t where vy is in meters per sec and t in seconds. The x component of its average velocity over the interval of time from t =0 to t= 2 sec is: O -2m/s O 2 m/s O -4m/s
- A bicyclist is practicing to increase his endurance for a one-hour trip. He has an average speed of 30 m/s in the first 30 min. If the cyclist wants an average speed of 40 m/s for the entire trip, by how much does he need to increase his average speed in the last 30 minutes?If the bushwalker takes 5 hours to complete the entire walk of 22 km including a 1.5 h rest, the average walking velocity of the bushwalker over the 5 hours is closest to A 2.19 km/h B 8.75 km/h C 0 km/h D 4.37 km/h E 2.69 km/h