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Grade: 12th pass
        
 a body has an initial velocity of 3 m/s and has a constant acceleration of 1 m/s2 normal to the direction of the initial velocity. then its velocity , 4 seconds after the start is
  1. 7 m/s along the direction of initial velocity 
  2. 7 m/s along the normal to the direction of the initial velocity
  3. 7 m/s mid way between the two direction 
  4. 5m/s at an angle of tan^-1 (4/3) with the direction of the initial velocity
4 years ago

Answers : (1)

Akshay
185 Points
							
let velocity is in x-direction. And acc. is in y-direction.
Initial velocity = 3 i + 0 j.
Acc = 1 j,
Final velocity = initial velocity + Acc. * t
        = (3 i) + ( 4 j)*1 = 3 i + 4 j =5 tan-1(4/3)
4 years ago
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