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3 years ago

Kent cycle at speed of 20km/h. How long does it takes for him to cycle 120 km?

Physics

2 answers:

kap26 [50]3 years ago

8 0

Answer:

477999999999

Explanation:

120899888

Eddi Din [679]3 years ago

4 0

Speed of bicycle = 20 km/hr (this (km/hr) is called kilometers covered in 1 hour that means you can covera distance of 20 km in 1 hour).

Distance Covered = 10 km , Time Taken = ?

Since,

Speed = Distance / Time Taken

=> Time Taken = Distance / Speed

=> Time Taken = (120/20) hr = 6 hrs..

Ans: 6 hrs

Hope its right and Hope it helps!!

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stiv31 [10]

Answer:

Speed at which the ball passes the window’s top = 10.89 m/s

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For the top of window (position A)

$s_A=0\times t_A+0.5\times 9.81t_A^2\\\\s_A=4.905t_A^2$

For the bottom of window (position B)

$s_B=0\times t_B+0.5\times 9.81t_B^2\\\\s_A=4.905t_B^2$

$\texttt{Height of window=}s_B-s_A=3.3\\\\4.905t_B^2-4.905t_A^2=3.3\\\\t_B^2-t_A^2=0.673$

We also have

$t_B-t_A=0.27$

Solving

$t_B=0.27+t_A\\\\(0.27+t_A)^2-t_A^2=0.673\\\\t_A^2+0.54t_A+0.0729-t_A^2=0.673\\\\t_A=1.11s\\\\t_B=0.27+1.11=1.38s$

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