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leva [86]
2 years ago
9

Ivan exerts 20 N of force to lift a basket 2 m. He then carries the basket 5 m across a room to place it on a shelf. Ivan does w

ork when he . The amount of work he does is .
Physics
2 answers:
amid [387]2 years ago
7 0
A) <span>Ivan does work when he lifts the basket

B) Work = Force * displacement 
W = 20 * 2
W = 40 Joules

So, The Amount of work he does is 40 Joules

Hope this helps!</span>
Cerrena [4.2K]2 years ago
5 0

Explanation :

It is given that,

Force acting on Ivan,  F=20\ N

Height of the basket above the ground, s = 2 m

Work done in this case would be :

 W=Fs\ cos\theta

Where

\theta is the angle between the force and the displacement and it is equal to 0.

So, W=20\ N\times 2\ m

W=40\ J

Ivan does work when he lifts the basket and it is equal to 40 J.

When he carries the basket 5 m across a room to place it on a shelf, then his weight is acting vertically downwards. The angle between the force and the displacement is now 90.

So, the work done he does is 0.                      

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Answer:

The deceleration is  a =  - 76.27 m/s^2

Explanation:

From the question we are told that

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From the law of energy conservation

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   and  PE_T is the potential energy of the before jumping  which is mathematically represented at

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and  PE_B is the potential energy of the person as he lands on the safety net which has a value of zero (because it is converted to kinetic energy )

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                v =  16.57 m/s

Applying the equation o motion

             v_f =  v  + 2 a s

Now the final velocity is zero because the person comes to rest

      So

         0 = 16.57 + 2 * a * 1.8

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            a =  - 76.27 m/s^2

         

         

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