Question

Two balls A and B are thrown vertically upwards with speed 10m/s and 20m/s respectively. What is the ratio of their displacement travelled in the last secon of their upward motion.

Answer 1

Answer:

Time to reach maximum height can be obtained from v=u+at

0=20+(−10)t

t=2s

s=ut+0.5at

2

=20(2)+0.5(−10)(2)

2

=20m

Thus, total distance for maximum height is 45 m

s=ut+0.5at

2

45=0+0.5(10)(t)

2t ′=3sTotal time= 3+2= 5s.

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