12.The velocity of a body at any instant is 10 m/s. After 5 sec, veloc

1.	12.The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocityat 3 seconds before that instant is(1) 8 m/sec1142) 4 m/sec(3) 6 m/sec(4) 7 m/sec
Answer» The velocity of a body at an instant is 10 m/s Acceleration = (v - u) / t= (20 - 10) / 5 = 2 m/s²Acceleration of body is 2 m/s² Now,v = u + at10 = u + (2 × 3)u = 10 - 6u = 4 m/sVelocity 3 seconds before was 4 m/s (2) is correct option 2 is the right answer The velocity of a body at an instant is 1.m/s Acceleration =(v-u)/t =(20-10)/5 = 2 m/ssAcceleration of a body is 2m/ssNow, applying Newton first law of motion, v =u +at10=u+(2*3)10-6 =uu = 4m/s

12.The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocityat 3 seconds before that instant is(1) 8 m/sec1142) 4 m/sec(3) 6 m/sec(4) 7 m/sec

Answer»

The velocity of a body at an instant is 10 m/s

Acceleration = (v - u) / t= (20 - 10) / 5 = 2 m/s²Acceleration of body is 2 m/s²

Now,v = u + at10 = u + (2 × 3)u = 10 - 6u = 4 m/sVelocity 3 seconds before was 4 m/s

(2) is correct option

2 is the right answer

The velocity of a body at an instant is 1.m/s

Acceleration =(v-u)/t =(20-10)/5 = 2 m/s*sAcceleration of a body is 2m/s*sNow, applying Newton first law of motion, v =u +at10=u+(2*3)10-6 =uu = 4m/s

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12.The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocityat 3 seconds before that instant is(1) 8 m/sec1142) 4 m/sec(3) 6 m/sec(4) 7 m/sec

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