Answer:21.45 m/s
Explanation:
Given
Mass of sport car=920 kg
Mass of SUV=2300 kg
distance to which both car skid is 2.4 m
coefficient of friction (
)=0.8
Let u be the initial velocity of both car at the starting of skidding
and they finally come to zero velocity
s=2.4 m
u=6.13 m/s
so before colliding sport car must be travelling at a speed of
(conserving momentum)
v=21.45 m/s
Answer:
second
Explanation:
the first let's everything appear red, the send would produce black(-ish) words on paper that's appealing blue
The power the swimmer must provide to overcome that drag force is 50 W.
<h3>What is work done?</h3>
Work done is equal to product of force applied and distance moved.
Work = Force x Distance
Given is an athlete, swimming at a constant speed, covers a distance of 203 m in a time period of 5 minutes and 50 seconds = 350 seconds. The drag force exerted by the water on the swimmer is 86.0 N.
Work done by drag force is W= F x d
So, W = 86 N x 203 m
W = 17.458 kJ
Power , a swimmer is provided P = Work done/ Time
P = 17458 / 350
P = 50 W
Thus, the power, the swimmer must provide to overcome that drag force is 50 W.
Learn more about Work done
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Average speed of the car is 11 m/s
Explanation:
- Speed is calculated by the rate of change of displacement.
- It is given by the formula, Speed = Distance/Time
- Here, distance = 2155 m and time = 195.9 s
Speed of the car = 2155/195.9 = 11 m/s
