a block is moved from rest through a distance of 4m along a straight line path. the mass of the block is 5kg and the force acting on it is 20N. if kinetic energy acquired by the block be 40J. at what angle to the path the force is acting.
A) 30°
B) 60°
C) 45°
D) none
Answers
Answered by
57
FS Cosθ = K.E
Cosθ = K.E / (F S)
Cosθ = 40 / (20 × 4)
Cosθ = 1 / 2
Cosθ = Cos60
θ = 60°
(B) is the correct option
Cosθ = K.E / (F S)
Cosθ = 40 / (20 × 4)
Cosθ = 1 / 2
Cosθ = Cos60
θ = 60°
(B) is the correct option
Answered by
2
Answer:
60°
Explanation:
work=change in k.e. ...work energy theorem
f.s cos thetha=k.e
20*4 cos thetha=40
cos thetha =40/80
cos thetha =1/2
thetha=60°
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