Question

please anyone tell me fast.... urgent!!!​

Answer 1

Answer:

ok

Explanation:

1500+54+72 km per hour

=2024 km

Answer 2

Given:

Initial speed (u) = 54 km/h = 15 m/s

Final speed (v) = 72 km/h = 20 m/s

Mass of car (m) = 1500 kg

To Find:

Work done by the force on the car (W)

Answer:

WORK-ENERGY THEOREM

The change in kinetic energy of a particle is equal to the work done on it by the net force.

$\bf \leadsto W = \Delta K \\ \\ \rm \leadsto W = K_f - K_i \\ \\ \rm \leadsto W = \dfrac{1}{2} mv^2 - \dfrac{1}{2} mu^2 \\ \\ \rm \leadsto W = \dfrac{1}{2} m(v^2 - u^2) \\ \\ \rm \leadsto W = \dfrac{1}{2} \times 1 500(20^2 - 15^2) \\ \\ \rm \leadsto W = 750(400 - 225) \\ \\ \rm \leadsto W = 750 \times 175 \\ \\ \rm \leadsto W = 131250 \: J \\ \\ \rm \leadsto W = 131.25 \: kJ$

$\therefore$ Work done by the force on the car (W) = 131.25 kJ