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Grade: 11
        An object of mass 1kg moving on a horizontal surface with initial velocity 8m/s comes to rest after 10s . If one wants to keep the object moving on the same surface with velocity 8m/s the force required is....1. 0.4N2. 0.8N3. 1.2N4. Zero
2 years ago

Answers : (2)

Diwankar singh
14 Points
							mass=1kginitial velocity`u`=8m/sfinal velocity`v`=0m/stime=10 sec.therefore,                  acceleration=v-u/t                                      =0-8/10                                      =-0.8m/s^2Force=mass*acceleration          =1*(-0.8)          =   -0.8NWe know that force cannot be in negative    therefore, force applied =0.8N
						
2 years ago
nidhi
35 Points
							
v = u + at
v = 0
0 = 8 – \displaystyle \mug(10)
\mu = 8/100 = 0.08
To move the body withconstant velocity on this surface, internal force applied should be equal to friction force
F = \mumg
   = (0.08)(1)(10)
   = 0.8N
one year ago
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