If a car has a velocity of 85 km/hr, how long will it take to accelerate to 45 km/hr if the acceleration is -3 km/hr/sec?

Physics

1 answer:

sweet [91]2 years ago

6 0

Answer:

slbohohohohhoohhoohooohhoohho

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A car speeds up from 0 m/s to 14.0 m/s in 325 s. What is the acceleration?

Anton [14]

Answer: $0.04308 m/s^2$

Explanation: Plug the variables into the equation: $a=\frac{v-v_{0} }{t}$ | $v$ equals initial speed, $v_{0}$ equals final speed and $t$ equals time.

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A marble, rolling with speed of 20m/sec rolls off the edge of the table that is 180m high (g=10m/sec2), find time taken to drop

natali 33 [55]

Answer:

Choice: c. 6sec

Explanation:

Horizontal Launch

When an object is thrown horizontally with a speed (v) from a height (h), it describes a curved path ruled by gravity until it finally hits the ground.

The horizontal component of the velocity is always constant because no acceleration exists in that direction, thus:

$v_x=v$

The vertical component of the velocity changes in time because gravity makes the object fall at increasing speed given by:

$v_y=g.t$

Where $g=10 m/s^2$

To calculate the time the object takes to hit the ground, we use the same formula as for free-fall, since the time does not depend on the initial speed:

$\displaystyle t=\sqrt{\frac{2h}{g}}$