A driver is traveling at 50 m/sec when she sees flashing lights ahead of her. Sh

Question

A driver is traveling at 50 m/sec when she sees flashing lights ahead of her. She puts on the brakes and decelerates (slows down) at a rate of 4 m/sec^2 before coming to rest How long does it take her to stop ? How far does she travel before she stops ? How long ? ___________ How for? ___________ A ball rolls off a horizontal shelf 12 m high. Before it hits the ground it has traveled 6 m horizontally. How long from when it leaves the table is the ball in the air ? What was the horizontal speed of the ball ? t = _________________ V_ox = ________________ A small plane is flying at 300 km/hr North (airspeed) when it encounters an airflow which is 70 km/hr East. Make a Drawing including velocity vectors rightarrow Calculate its Ground Speed aid its ground direction.

Explanation / Answer

here,

3)

initial speed of cvar , u = 50 m/s

accelration , a = - 4 m/s^2

a)

let the time taken be t

v = u + a * t

0 = 50 - 4 * t

t = 12.5 s

the time taken is 12.5 s

b)

let the distance travelled be s

using third equation of motion

v^2 - u^2 = 2 * a * s

0 - 50^2 = - 2 * 4 * s

s = 312.5 m

the distance travelled before stopping is 312.5 m

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