Explanation:
Here,
Given,
Mass(m)=40 kg
Gram=9.8m/s
Now,
Weight=m x g
or, weight= 40x9.8
=392.0
Hope you have understood
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Answer:
The force required to maintain an object at a constant velocity in free space is equal to Zero.
Explanation:
It is given that,
Radius of curvature of the mirror, R = 1.54 cm
(a) We have to find the focal length of the mirror. The relationship between the focal length and the radius of curvature is given by :

f = focal length of the mirror

f = 0.77 cm
(b) The power of mirror is given by the reciprocal of focal length i.e.
Power, 
P = 1.29 diopters
Hence, this is the required solution.
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