# Physics: 1. If a tricycle travels at an average speed of 22 kph, how many hours will it take to cover 40 km? 2. How long does it take Budoy's car to change its velocity from 12 m/s to 25 m/s if the acceleration is 5 m/s2? 3. Tommy loves taking care of homing pigeons. He sent note to his crush who lives 24.0 km away from his house. These birds fly at a rate of 48.2 km/h. How long will it the note reach Tommy's crush? 4. Calculate the acceleration of a car from rest that travels 24 m/s due east in 30s. 5. The speed of the car is decreased uniformly from 30 m/s to 10 m/s in 4s. What is its acceleration? Please answer.. I need it now.. WITH SOLUTION.. Thanks.....

1
by Candido

2014-11-19T21:38:54+08:00

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1.s=d/t
t=d/s
t=40 km/22 kph
t=1.81818181818182

2.a=(v-u)/t
t=(v-u)/a
t=(25m/s-12m/s)/5 mps^2
t=13m/s/5mps^2
t=2.6s

3.s=d/t
t=d/s
t=24km/48.2kmph
t=0.5 h

4.a=24mps/30s
a=0.8mps^2

5.v=s/t
v=30mps/4s
v=7.5mps

v=s/t
v=10mps/4s
v=2.5mps

a=(7.5-2.5)/4
a=5/4
a=1.25mps^2