The figure shows the velocity of a particle as it travels along the x-axis. What

Question

The figure shows the velocity of a particle as it travels along the x-axis. What is the direction of the acceleration at t = 0.5 s? in the +x direction in the -x direction The acceleration is zero. Insufficient information A car accelerates from 10.0 m/s to 30.0 m/s at a rate of 3.00 m/s. How far does the car travel while accelerating? 133 m 226 m 399 m None of the above. Water drips from rest from a leaf that is meters above the ground. Neglecting air resistance, what is the speed of each water drop when it hits the ground? 20 m/s 15 m/s 17 m/s 30 m/s Two forces act on a 4.5kg resting on a frictionless surface as shown What is the magnitude of the horizontal acceleration of the 0.82 m/s 3.2 m/s 1.8 m/s. 1.2 m/s 8.9 m/s A hiker throws a stone from the upper edge of a vertical cliff. The stone's initial velocity is 25.0 n directed at 40.0 degree with the face of as shown in the figure. The stone hits the ground 3.75 after being thrown and feels no appreciable air resistance as it falls. What are the values of horizontal and vertical components of the initial velocity?

Explanation / Answer

7 )

here we have velocity is decreases in the interval 0 to 1

t = 0.5 sec given

so in the - X direction it moves

or negative X direction is moves

option " B " correct

8 )

V2 = u2 + 2 a s

302 = 102 + 2 X 3 X d

s = 133.3 m

option " B " correct

9 )

using equation

V = ( 2 g h )1/2

V = ( 2 X 9.8 X 15 )1/2

V = 17.1 m/sec

option " D " correct

10 )

using F = m a

a = F / m

a = ( 3.7 + 5.9 cos43 ) / 4.5

a = 1.78 m/sec

option " C " correct

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