1) A ball is bounced against the ground at an angle of 60 degrees to the horizontal and at a speed of 20 metres per second. Ignore air resistance for this question.
a) What horizontal distance does the ball achieve before hitting the ground again?
b) Which graph best represents the kinetic energy of the tennis ball in relation to the horizontal distance from where it contacted the ground?
2) Select the best answer. Under what conditions is the magnetic force on a wire (with current running through it) zero?
a) The wire is parallel to the magnetic field lines
b) The wire is perpendicular to the magnetic field lines
c) The magnetic force is constant regardless of orientation
3) A shopping trolley is pushed at a speed of 2 m/s to the top of a hill and let go. Assume that there is no driving force on the pram and no friction.
a) what speed will it have by the time it reaches the bottom of the 10 m hill?
b) Draw a graph showing the changes in the trolley’s gravitational and kinetic energy as a function of horizontal distance from the top of the hill.
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