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The speed time graph of a body of mass 5...

The speed time graph of a body of mass `50kg` is shown in (figure). Calculate the force acting in the body
(i)from 0 to `4s` (ii)from 4 to `6s`

Text Solution

Verified by Experts

Here, `m=50kg, F=?`
(i) From 0 to 4 sec
graph shows that speed `=20m//s` = constant
`:.` acceleration, a=0
`F= ma` = Zero.
(ii) From `4 s` to `6 s`
graph shows that the body is brought to test
`a=("final velocity-initial velocity")/("time taken")= (0-20)/2= -10m//s^(2)`
`F=ma=50(-10)= -500N`
Negative sign indicates that force applied oppose the motion.
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