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Which of the following are obtained by d...

Which of the following are obtained by dividing total displacement by total time taken?
a) Average velocity
b) Instantaneous velocity
c) Uniform velocity
d) Speed

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
`S=100m, t=10.54sec, m=50kg`
Themotion can be assumed to be uniform because acceleration is minimum
a. `Speed v=S/t=9.487 m/s`
So K.E. `=1/2mv^2=2250J`
`b. Weight `=mg=490J`
`given R=(mg)/10=49J`
So, work done against resistance
`W_F=-RS=-49xx100`
`rarr W_(Ff)=-4900J` c. To maintain her uniform speed she has to exert 4900J of energy to overcome friction.
`P=W/t`
`=4900/1054=465W`
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