1- Ann is driving down a street at 60 km/h. Suddenly a child runs into the street. If it takes Ann 0.774 s to react and apply the brakes, how far will she have moved before she begins to slow down? Answer in units of m.
2- A glacier advances at 4.8 × 10−6 cm/s. How far will it move in 75000 s? Answer in units of cm. How far will it move in 6.4 y? Answer in units of cm.
3- A polar bear starts at the North Pole. It travels 1 km South, then 1 km East, then 1 km North to return to its starting point. This trip takes 0.5 h. What was the bear’s average velocity? Answer in units of km/h.
4.8x10^-6 X 75000s = 3.6 cm
Find the total seconds in a year.
60 seconds x 60 minutes x 24 hours x 365 days = 31536000 seconds.
Multiply by the speed, the units cancel.
4.8x10^-6 X 31536000s = 1513.728 cm
0.774s X 1/360h/s = 0.774/360 = 0.00215h
Multiply by the speed, the units cancel.
0.00215 X 60km/h = 0.129km
Convert to meters from kilometers
0.129km X 1000m/km = 129 Meters
always convert to m.s^-1 when working with equations of motion,
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