General Physics - mastering physics (chap 2 and 3)

In an 8.00 km race, one runner runs at a steady 11.4 km/h and another runs at 14.8 km/h .

1.84 km

A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 8.0 m from the takeoff point.

11.5 m/s 11.0 m/s

Water at the top of Horseshoe Falls (part of Niagara Falls) is moving horizontally at 8.8 m/s as it goes off the edge and plunges 53 m to the pool below.

15

Small-plane pilots regularly compete in "message drop" competitions, dropping heavy weights (for which air resistance can be ignored) from their low-flying planes and scoring points for having the weights land close to a target. A plane 55 m above the ground is flying directly toward a target at 51 m/s .

171m directly over

You're driving down the highway late one night at 19 m/s when a deer steps onto the road 43 m in front of you. Your reaction time before stepping on the brakes is 0.50 s , and the maximum deceleration of your car is 11 m/s2 .

17m 26 m/s

The takeoff speed for an Airbus A320 jetliner is 82 m/s .

2.2 m/s2 0.22g 37s 4.58km

A football is kicked straight up into the air; it hits the ground 4.2 s later.

21.6m 20.6

Raindrops are falling straight down at 11 m/s when suddenly the wind starts blowing horizontally at a brisk 5.0 m/s. From your point of view, the rain is now coming down at an angle.

24

Light-rail passenger trains that provide transportation within and between cities speed up and slow down with a nearly constant (and quite modest) acceleration. A train travels through a congested part of town at 7.0 m/s . Once free of this area, it speeds up to 13 m/s in 8.0 s. At the edge of town, the driver again accelerates, with the same acceleration, for another 16 s to reach a higher cruising speed.

25.0 ms

When striking, the pike, a predatory fish, can accelerate from rest to a speed of 4.0 m/s in 0.12 s .

33 m/s2 0.24m

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 6.0 s later.

5.5 m/s2

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest.

67 m/s2

A car traveling at 38 m/s runs out of gas while traveling up a 6.0 ∘ slope.

700m

Anita is running to the right at 5 m/s , as shown in (Figure 1) . Balls 1 and 2 are thrown toward her by friends standing on the ground. According to Anita, both balls are approaching her at 19 m/s .

v1 = 24.0 ms v2 = 14.0 ms