Question

A car is moving with a constant speed of 20 m/s
against a resistance of 100 N. The power exerted
by the car is​

Answer 1

Given :

• Speed of the car = 20 m/s
• Resistance Force = 100 N

To Find :

• The power exerted by the car

Solution :

Expression for power is given by , P = F × v

Here ,

• P is power
• F is Force
• v is velocity

Substituting the values we have in the formula ,

→ Power = 100 N × 20 m/s

→ Power = 2000 W

Hence ,

• The Power exerted by the car is 2000 W.

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Power :

• Power is the rate at which work is done.

• Other expression for power is , P = Work/Time

• SI unit of Power is Watt (W) or Joule per sec (J/s) {since 1 watt = Joule/sec}

Answer 2

Answer:

Given :-

• Speed of car = 20 m/s
• Resistance = 100 N

To Find :-

Power exerted

Solution :-

As we know that

${\boxed {\underline { \frak {P = F \times V}}}}$

Here,

P is the Power

F is the Force

V is the Velocity

$\sf \dashrightarrow \: P = 100 \times 20$

$\frak \red{P = 2000 \: W}$

Or

$\frak \pink{P = 2 kW}$

Learn More :-

• Watt is the SI unit of Power
• Newton is the SI unit of Force
• m/s is the unit of Velocity
• 1000 W = 1 kW