The Us athlete Florence Griffith Runs 10m is 10s what his Velocity?
Answers
Answer:
Uniform speed of athlete v = d/t
= 100 m / 10.54 s
v = 9.49 m/s.
(a) K.E of the athlete @ full speed :- 1/2 mv²
= 1/2 ( 50× 9.49² )
= 4503.005 /2
= 2251 J.
K.E of the athlete at full speed is 2251 J.
(b) Work done by resistance :-
Weight of the athlete = mg
= 50 × 9.8
=490 N.
Now resistance force or force of the resistance ,
F = mg / 10
F = 49 N.
Since she is running with the constant speed, Net force occurring in the direction of movement is zero.
Now work done by the resistance,
= F ×s
= 49 × (-100 ) { Negative sign shows, It's opposite to the force}
= - 4900 J.
Hence work done by resistance is -4900 N.
(c) Power to maintain uniform speed :-
Her force applied is 49 N and constant speed is 9.49 m/s , then
Power = F × v
P = 49 × 9.49
P = 465 W.
Hence power to maintain uniform speed is 465 W
Explanation:
Answer:
10m/10s
1m/s is his velocity
Explanation: