Question

State Newton’s second law of motion. Derive the relation between force and acceleration.A constant force acts on an object of mass 2 kg for 10 s and increases its velocity from 5 m/s to 10 m/s. Find the magnitude of applied force.

Answer 1

Answer:

Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.

M=2kg=

t=10sec

u=5m/sec

v=10m/sec

v=u+at

a=(v-u)/t=(10-5)/10=1/2m/sec²

F=Ma=2×1/2=1kgm/sec²=1N

if this force is applied for 15sec then, velocity is

F=mv/t

v=(1×15)/2=7.5m/sec.

Answer 2

Answer:

the answer will be 1N

F=M(v-u)/t

=2×(10-5)/10

=1N