A person throws a ball upwards with some speed so that it travels a distance of 25 meter before it
stops and starts descending towards the earth. The ball returns to the same spot on the ground. It is
known from an approximation that the acceleration due to gravity in the area is 10 m/s2
in the area.
The ball takes the same time to go up and to come down. Based on the information provided and
using the equations of motion, answer the following
questions:
a) How long did the ball take to travel to the maximum height?
b) What was the speed with which the ball was thrown up?
c) Why did the ball take the same time to travel up and come down?
d) If this experiment was done while standing on a truck moving at a uniform speed, will it give us
the same result? Explain briefly.
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Answer:
t=2.5sec. The time taken for upward journey is equal to the time taken for downward journey. Therefore, total time taken by the ball =2.5+2.5=5sec.
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