Q.18. Two balls are thrown from a height of 20 m. Ball one is
thrown upward with a speed of 2 m/s. Ball two is thrown down-
ward with a speed of 2 m/s. What is the ratio of the speeds of the two balls, when each hits the ground? (gravitational a = 10 m/s2
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Basic Science
Basic Physics
Two balls, A and B, are thr...
GENERAL KNOWLEDGE
Two balls, A and B, are thrown simultaneously, A vertically upward with a speed of 20 m/s from the ground and B vertically downward from a height of 40 m with the same speed and along the same line of motion. At what points do the two balls collide by taking acceleration due to gravity as 9.8 m/s
2
?
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ANSWER
let the accelerations of both ball be a
A
=−g,a
B
=−g
and let the velocities be v
A
=20m/s,v
b
=−20m/s
relative acceleration=a
A
−a
B
=0
relative velocity=v
A
−v
B
=40m/s
s=ut+
2
1
at
2
s=40m,u=40m/s,a=0
∴t=
v
s
=
40
40
=1s
For distance from ground we will observe particle A
s=ut+
2
1
at
2
v=20m/s,t=1s,a=−g=−9.8m/s
2
s=20−
2
1
×9.8×1
2
=15.1m