An object is moving in a straight line with constant acceleration. Initially it is traveling at
16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?
A) 30 m B) 39 m C) 48 m D) 57 m
Answers
Explanation:
the answer is c) 48
Hope it helped u!
Given : An object is moving in a straight line with constant acceleration. Initially it is traveling at 16 m/s.
Three seconds later it is traveling at 10 m/s.
To Find : How far does it move during this time?
A) 30 m B) 39 m C) 48 m D) 57 m
Solution:
As object is moving at constant acceleration hence
S = (1/2)(u + v) t
u = 16 m/s
v = 10 m/2
t = 3 secs
S = (1/2) (16 + 10) * 3
=> S = 13 * 3
=> S = 39 m
Another method :
v = u + at
=> 10 = 16 + a(3)
=> a = - 2
v² - u² = 2aS
=> 10² - 16² = 2(-2)S
=>- 156 =-4S
=> S = 39 m
Moves 39 m during this time
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