AP EAMCET202017 Sep 2020Evening ShiftPhysicsMotion in One DimensionActual
A body of mass (10 ~kg ) has constant velocity of (10 ~m ~s ⁻¹ ). A constant force is applied for a duration of (4 ~s ) on the object and gives it a speed of (2 ~m ~s ⁻¹ ) in opposite direction. Then, find acceleration produced in it.
Options
- A(3 ~ms ⁻² )
- B(-3 ~ms ⁻² )
- C(0.3 ~ms ⁻² )
- D(-0.3 ~ms ⁻² )
Correct answer
B. (-3 ~ms ⁻² )
Step-by-step solution
Mass of body, (m=10 ~kg ) Velocity, (v=10 ~ms ⁻¹ ) (t=4 ~s ) Final velocity of the body, (v=-2 ~ms ⁻¹ ) Since, final velocity of the body decreases on application of constant force, hence acceleration is negative. By first equation of motion, ( aligned & v=u+a t & a= v-u t = -2-10 4 =- 12 4 =-3 ~ms ⁻² aligned )