Choose, the one alternative that, best complete, the statements Suppose that a f
ID: 585773 • Letter: C
Question
Choose, the one alternative that, best complete, the statements Suppose that a far traveling to the West (-x direction) begins to slow down as M approaches a traffic light. Make a statement concerning its acceleration.- The acceleration is zero. The car is slowing down, and its acceleration is negative. The car is slowing down, and its acceleration is positive. A statement cannot be made using the information given. Suppose a ball is thrown straight up Make a statement about the velocity and the acceleration when the ball reaches the highest point. Neither its velocity nor its acceleration is zero. Both its velocity and its acceleration are zero. Its velocity is not zero and its acceleration is zero. Its velocity is zero and its acceleration is not zero. The graph in the figure shows me position of a particle as it travels along the x-axis.Explanation / Answer
1) B
when car is begin to slow down, velocity will decreae.it means car will decellarate. a=so accelaration is negative
2) D
because at accroding to the enargy consevation theory,'
potentila energy+ kinetic energy=constant
when throw the ball in the floor, it has only kinetic energy (velocity has)
if it istravel in the air oppose to the gravitinal field, its velocity will reduce.
if it reaches the maximum point, then it will come down. so at that point velocity is zero
but in that motion, accelaration is gravitional force.it is not exits. so accelation is not zero
3) this graph draw displacent vs time
velocity=displacement/time
if velocity is zero ,x/t=0
when gradient of the graph will zero, that is velocity is zero
3sec
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