Erin throws a golf ball (0.05 kg) vertically upwards giving it 12 J of kinetic energy. If there is no air resistance, the maximum height reached by the ball before it starts moving downwards is ________________________m. (Take g = 10 m/s2.)
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Answers
Explanation:
0.5N, in vertically downward direction, in all cases
Acceleration due to gravity, irrespective of the direction of motion of an object, always acts downward. The gravitational force is the only force that acts on the pebble in all three cases. Its magnitude is given by Newtons second law of motion as:
F=ma
Where,
F=Net force
m= Mass of the pebble=0.05kg
a=g=10m/s2
F=0.05 × 10=0.5N
The net force on the pebble in all three cases is 0.5N and this force acts in the downward direction.
If the pebble is thrown at an angle of 45o with the horizontal direction, it will have both the horizontal and vertical components of velocity. At the highest point, only the vertical component of velocity becomes zero. However, the pebble will have the horizontal component of velocity throughout its motion. This component of velocity produces no effect on the net force acting on the pebble
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