Question 7 Chris and Dave raced up a 25 m hill. Chris took 40 seconds to reach the top and Dave took 45 seconds. Both men have the same weight. Which of the following is true?
Chase did more work than Dave
O Dave did more work than Chris
Chris produced more power than Dave
Dave produced more power than Chris

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader