A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car is v, the rate at which the engine of the car is doing work, will be:

Question

A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car is v, the rate at which the engine of the car is doing work, will be: (A)  (ma-R) upsilon  (B)  (R+ma) upsilon  (C)  ma upsilon  (D)  R upsilon

Tardigrade Admin · Accepted Answer

Total force require to oppose the resistive force and move with acceleration a is, F = ma + R Power is given by, ∴ P =( ma + R ) V

Q. A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car is v, the rate at which the engine of the car is doing work, will be:

$(ma - R) υ$

$(R + ma) υ$

$ma υ$

$R υ$

Total force require to oppose the resistive force and move with acceleration a is,
$F = ma + R$
Power is given by,
$∴ P = (ma + R) V$

Q. A car of mass m is driven with acceleration a along a straight level road against a constant external resistive force R. When the velocity of the car is v, the rate at which the engine of the car is doing work, will be:

(ma−R)υ

(R+ma)υ

maυ

Rυ

Total force require to oppose the resistive force and move with acceleration a is, F=ma+R Power is given by, ∴P=(ma+R)V

$(ma - R) υ$

$(R + ma) υ$

$ma υ$

$R υ$

Total force require to oppose the resistive force and move with acceleration a is,
$F = ma + R$
Power is given by,
$∴ P = (ma + R) V$