A 4.0 kg mass stone is thrown vertically upwards at a speed of 20 m/s. I) determine the maximum height it reaches.
II) Determine your speed when in the
half of its maximum height.
III) Determine the total mechanical energy at this point. of
work performed by the gravitational force from the launch point to the return to that point.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

2. -/1 pointsserpse10 2.7.p.017.mi. an object moving with uniform acceleration has a velocity of 14.0 cm/s in the positive x direction when its x coordinate is 2.97 cm. if its x coordinate 2.85 s later is -5.00 cm, what is its acceleration? cm/s2 need ? read it master it