Question

Q. How does an applied force changes the speed of an object?

Answer 1

an external force or applied force changes the acceleration of a body. as

F =ma

as acceleration is change in velocity by time.

if acceleration increases the velocity also increases

a = (v - u) ÷ t
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Answer 2

Explaining mathematically
Force is rate of change of momentum
So
F=dP/dt
p=mv
=mdv/dt since m is constant
now dv is nothing but change of velocity
That means the force has changed the speed
Hope it helps
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