answer the following below

un of the boats average velocity for the one hour tripr 7. A projectile fired from a gun has initial horizontal and vertical components of velocity equal to 30 m/s and 40 m/s, respectively. a) At what angle is the projectile fired (measured with respect to the horizontal)? b) Approximately how long does it take the projectile to reach the highest point in its trajectory? c) What is the speed of the projectile when it is at the highest point in its trajectory? d) What is the acceleration of the projectile when it reaches its maximum height? 8. Two blocks connected by a cord passing over a small, frictionless pulley rests on a frictionless plane (see figure on the right side). (a.) Which way will the system move when the system is released from rest? (b) What is the acceleration of the blocks? (c) what is the tension in the cord? 9. An athlete whose mass is 90.0 kg is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 490 N. He lifts the barbell a distance of 0.60 m in 1.6 s. Find the total force that his feet exert on the ground as he lifts the barbell