Question

a car speeds up while the engine delivers constant power.Is the accelaration greater at the beginning or at the end ? explain

Answer 1

Answer:

$p = f \times v$

here in this formula, p is the power, f is the force acting and v is the average velocity of the object. Now if we calculate this for very small instances, then we will get that,

p at a instant=force x velocity

since the car is speeding up, it's velocity is increasing so, the force acting is decreasing (since the power given is constant) so, at beginning there is more force as compared to at the end. so, the acceleration is acting in the beginning.