Physics

1 (Acceleration ) Can anything have an acceleration in the opposite direction to its velocity ? If so , give some examples

Yes , since acceleration has two components : velocity and direction There are three instances when acceleration can happen : first , there is constant velocity but a change in direction second , there is changing velocity but same direction and third , both the velocity and the direction are changing . In this case , acceleration happens in such a manner that the velocity is increasing with the direction changed . A very simple example would be the projectile of a

ball thrown from the top of a building . While the ball falls down , its velocity is increasing , and its direction is going down (meaning , negative . Another example would be phone which slides down the stairs . As it goes down its velocity is increasing while its direction is going downwards

2 (Free Fall ) Can anything ever have a downward acceleration greater than g ? If so , how can this be accomplished

Yes , it is possible that a downward acceleration is greater than g (acceleration due to gravity which is -9 .8 m /s2 . In the concept of free fall where air friction is neglected , the acceleration becomes zero which means that the downward velocity of the falling object is constant in time

3 (Mass and Weight ) Consider the statement : Sara weighs 55kg . What is wrong with the statement ? Give two ways to correct it

Mass is different from weight . By equation , weight is equal to mass (m multiplied with...