PLEEEAAASEEE HELP ME Mulitple Choice please 1.An object is moving to the left wh

Question

PLEEEAAASEEE HELP ME

Mulitple Choice please

1.An object is moving to the left while being acted on by a force, F, that also points to the left but is decreasing in magnitude with time. Whcih statement is correct.

A)The object's speed must be DECREASING

B)The object's speed must be INCREASING

C)Either a) or b) could be true

D)Neither a) or b)

E)None of the above

2.You throw an object of mass m up in the air, with speed v.You throw a second object of mass 2m straight down, at the same speed v. What is the spped v, of the second mass, relative to the first, when they hit the gorund? Ignore AIR RESISTENCE.

a)2V

B)(2v+v)=3v

c)v

d)can't tell without knowing height

e)4v

3.Which of the follwoing statements is true regarding the motion of an automobile?

A)iT IS POSSIBLE TO BE ACCELERATING WHILE TRAVELLING AT CONSTANT SPEED.

B)it is possible to round a curve with zero acceleration

c)it is possible to round a curve with constant acceleration

d)a) and c) are true

e)All of the above are true

Explanation / Answer

1)answer

A)The object's speed must be DECREASING

because

f = m x a

mass is constant, so a is decreasing which will ultimately cause decrease in velocity

2)ans is

c) v

because the mass will not influence the velocity

3)ans is

d) a and c are true

magnitude of speed can be constant while there is continuous change in the direction of an object. and as per the defination of acc. it is rate of change of velocity which is a vector quantity so its magnitude may remain constant but direction may change will result in chnage in acceleration

When an object is moving at a constant speed around a circular path or curve with constant radius, the magnitude of the centripetal acceleration is constant.

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