Question

Q3)A stone is thrown in vertically up ward direction with a velocity of of 5m/s .If the acceleration
of the stone during its motion is 10m/s^2 in the down ward direction.What will bebthe height
attained by the stone and how much time will it take to reach there? ​

Answer 1

Answer :

Given, initial velocity, u=5ms

−1

Final velocity, v=0

Since, u is upward & a is downward, it is a retarded motion.

∴a=−10ms

−2

Height attained by stone, s=?

Time take to attain height, t=?

(i) Using the relation, v

2

−u

2

=2as, we have

s=v

2

−u

2

/2a

=(0)

2

−(5)

2

/2×(−10)=1.25m

(ii) Using the relation, v=u+at

0=5+(−10)t or

t=5/10=0.5s

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