A river has a steady speed of 0.42 m/s. A student swims upstream a distance of 1.3 km and swims back to the starting point.  a.    If the student can swim at a speed of 1.01 m/s in still water, how long does the trip take? mins    (round off to the nearest minute) b.    How much time is required in still water for the same length swim? mins  (round off to the nearest minute)

A cheetah sees a gazelle running at a constant speed of 12.4 m/s. The gazelle is 15 m ahead of the cheetah. The cheetah starts from rest to chase (with constant acceleration) the gazelle. After 4.2 s the cheetah catches the gazelle. a.)Determine the distance that cheetah traveled before it catches the gazelle. b.) What is the acceleration of the cheetah? c.) What is the cheetah's speed when it catches the gazelle?

A stant motorcyclist is trying to jump over fifteen buses set side to side .each bus is 2.50m wide and a 30degree ramp has has been Installed on either side of the line of buses . A.what is the minimum speed at which she must travel to safely reach the other side? B.How long will she be in the air?

Suppose a rock is launched from the ground straight upward (use up as the positive direction) and reaches its maximum height in a time of 3.0 s. Then the rock descends back to the ground. (To simplify your numbers, you may use |g| = 10 m/s².) Find the following: a. The maximum height reached above the ground. b. The velocity of the rock at the time t = 4.5 s.

A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30.0 m/s^2 for 30.0 s, then runs out of fuel. Ignore any air resistance effects. a. What is the rocket's maximum altitude? b. How long is the rocket in the air? c. Draw a velocity vs. time graph for the rocket from lift off until it hits the ground.

When you blink your eye, the upper lid goes from rest with your eye open to completely covering your eye in a time of 0.024 s.a. Estimate the distance that the top lid of your eye moves during a blink.b. What is the acceleration of your eyelid? Assume it to be constant.c. What is your upper eyelid’s final speed as it hits the bottom eyelid?

A ball is kicked from the ground with an initial speed = 50 m/s at an angle of |V|20. A. What is the time t it takes for the ball to reach the maximum height? B. Find the maximum height Y C. Find the Horizontal distance X covered by the ball D. What is the position X at t= 1 s ? E. What is the height Y at t = 1 s ? F. What is the x-velocity at t = 1s?Vx

Driving down the road at a speed of 23.9 m/s, you suddenly notice a fallen tree blocking the road a distance of 82.0 m ahead of you. You step on the brake pedal and decelerate at a constant rate. What must the magnitude of your acceleration be so that you will come to a stop 6.6 m in front of the tree?   a. 3.79 m/s^2   b. 3.48 m/s^2   c. 3.22 m/s^2   d. 7.58 m/s^2

you and your best friend are away on vacation. Your hotel room is on the 5th floor. you and your friends decide to practice your aiming skills by dropping water balloons from the balcony of your hotel room. You drop a balloon from the ledge and it accelerates uniformly to the ground. a. If the balcony is 25m above the ground, how long does it take the balloon to reach the ground? b. What is the final velocity of the balloon just before it hits the ground? c. Draw a representative position vs time graph for the motion described above and describe the motion.

I only need help with "part b"