Question

13. An object is thrown upwards with a velocity of 20 m/s. Find the velocity and the work
done at maximum height. Let the value of g be 9.8m/s​

Answer 1

Distance travelled, s = 10 m
Final velocity, v = 0 m/s
g = -9.8 m/s
2


1) Using,
v
2
−u
2
=2gs
u
2
=196
u=14m/s, where u is the velocity with which the object is thrown upwards.

2) Using,
v=u+gt
t=
g
v−u
​
=1.43


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