Lim lifts a 2kg weight vertically. If he lifts it so that way the velocity of the weight
is constant, how much force is he using?
(Assume g=-9.8ms?). (10 marks)
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Given: Lim let's a 2 kg weight vertically. He lifts it so that the velocity of the weight is constant.
To find: Force he is using to lift the weight
Explanation: Mass(m)= 2 kg
Since he is lifting it with constant velocity, the acceleration in this case is zero. Therefore, no other acceleration is acting on the body except the acceleration due to gravity.
Acceleration due to gravity= -9.8 m/s^2
Therefore, force= mg = 2* -9.8
= -19.6 N
The minus sign signifies that force is acting against the acceleration due to gravity.
Therefore, the force he is using to lift the weight is -19.6 N.
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