A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is

Question

Accepted Answer

Correct answer: A. (a): The force is constant, i.e., the acceleration is constant. The distance is decreasing with time. Therefore it is retardation. 1^ st second u 1- (1/2 )a 1=5 m (i) 3^ rd second u 3- (1/2 )a 9- (u 2- (1/2 )a 4 )=2 m ∴u 1- (1/2 )a 5=3 (ii) (i) - (ii) gives (1/2) a 4=3 ⇒a=1.5 m/s^2 ∴ Constant force = ma=4 1.5=6 N (This is a retarding force as a is negative)

$A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is$

Solution

More Newton's Laws of Motion PYQs