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pishuonlain [190]

3 years ago

10

If you push on a heavy box that is at rest, you must exert some force to start its motion. 5. however, once the box is in motion

you need a smaller force to maintain that motion. why?

1 answer:

Free_Kalibri [48]3 years ago

5 0

The potential energy has turned into kinetic energy and energy is not lost on the box, some is lost to friction, but most of it is still kept.

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A sprinter accelerates from rest to 10.0 m/s in 1.28 s . Part A Part complete What is her acceleration in m/s2? a a = 7.81 m/s2

Mashutka [201]

Explanation:

It is given that,

Initial speed of sprinter, u = 0

Final speed of sprinter, v = 10 m/s

Time taken, t = 1.28 s

a. We need to find the acceleration of sprinter. It can be calculated using first equation of motion as :

$a=\dfrac{v-u}{t}$

$a=\dfrac{10\ m/s}{1.28\ s}$

$a=7.81\ m/s^2$

b. Final speed of the sprinter, v = 36 km/h

Time, t = 0.000355 h

Acceleration, $a=\dfrac{36}{0.000355}$

$a=101408.45\ km/h^2$

Hence, this is the required solution.

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3 years ago