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Q.

What changes happen when an object accelerates?


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a

Its speed always increases

b

Its velocity always increases

c

It always falls towards the earth

d

A force always acts on it 

answer is D.

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Detailed Solution

An object accelerates only when a force is acting on it.
The rate of change in an object's velocity with respect to time is known as its acceleration.= v/t yields it.
Newton's second law of motion states that any force acting on a body with mass m will often cause it to accelerate in the force's direction. The force can be estimated using the formula: = ma,
where a represents the object's acceleration.
= F/m is the formula used to compute the acceleration caused by the application of force.
 
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