Question

a force of 5N making an angle theta with the horizonatal acting on an abject displaces it by 0.4m along the horizonatal direction. if the object gains kinetic energy of 1J what is the horizonatal component of the force if the surface is frictionless

Answer 1

t-theta
horizontal component of force = Fcost
work done by horizontal component of force on object is
 W = Fx . d
 W= Fcost . d
 given K.E = 1J i.e W=1J
Fd cost = 1
5 x 0.4 x cost = 1
cost = 1/2
t= cos-1(1/2)
  = 60
therefore horizontal component of force is 5/2

Answer 2

Answer:

the answer is 2.5N

Explanation: